DOCSLIB.ORG

Lemhi County, Idaho

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Lemhi County, Idaho DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY GEORGE OTIS SMITH, DIRECTOR BUIJLETIN 528 GEOLOGY AND ORE DEPOSITS 1 OF LEMHI COUNTY, IDAHO BY JOSEPH B. UMPLEBY WASHINGTON GOVERNMENT PRINTING OFFICE 1913 CONTENTS. Page. Outline of report.......................................................... 11 Introduction.............................................................. 15 Scope of report......................................................... 15 Field work and acknowledgments...................................... 15 Early work............................................................ 16 Geography. .........> ....................................................... 17 Situation and access.........................--.-----------.-..--...-.. 17 Climate, vegetation, and animal life....................----.-----.....- 19 Mining................................................................ 20 General conditions.......... 1..................................... 20 History..............................-..............-..........:... 20 Production.................................,.........'.............. 21 Physiography.............................................................. 22 Existing topography.................................................... 22 Physiographic development............................................. 23 General features...............................................'.... 23 Erosion surface.................................................... 25 Correlation............. 1........................................... 25 Age of the surface................................................. 26 Early Eocene elevation............................................ 28 Bearing of Eocene erosion surface on economic problems.............. 29 Post-Eocene topography................................................ 29 General geology............................................................. 30 Age and succession of the rocks........................................ 30 Sedimentary rocks..................................................... 30 Algonkian system.................................................. 30 Paleozoic rocks................................................... 32 Cambrian system............................................... 32 Ordovician system............................................. 33 Silurian (?) system............................................ 33 Devonian system............................................... 34 Carboniferous system.......................................... 34 Cenozoic deposits................................................... 35 Tertiary system............................................... 35 Miocene lake beds......................................... 35 Distribution and thickness.-............................ 35 Relations and constitution............................. 36 Deformation............................................ 38 Age................................................... 38 Correlation................................;............ 39 Extent of the Miocene lake............................ 40 Quaternary system............................................. 40 Pleistocene deposits....................................... 40 3 4 - CONTENTS. General geology Continued. page. Igneous rocks......................................................... 41 Archean gneiss............................'.................'....... 41 Late Cretaceous or early Eocene granite............................. 42 Dikes............................................................. 43 Distribution and character..................................... 43 Types......................................................... 44 Age........................................................... 46 Tertiary lavas...................................................... 47 Epitome of geologic history................................................ 48 Ore deposits.............................................................. 49 General features....................................................... 49 Character of deposits................................................ 49 Distribution...................................................... 50 Geologic relations................................................. 50 Gold deposits.......................................................... 51 Placers............................................................ 51 Distribution................................................... 51 Production and history......................................... 52 Origin of placer gold........................................... 52 Character of the placer deposits................................. 53 Age of placers.................................................. 53 Late Tertiary gold veins............................................ 54 Distribution........'........................................... 54 Treatment of the ores.......................................... 54 Geologic relations.............................................. 55 ' Character..................................................... 55 Ores.......................................................... 55 Age and genesis............................................... 56 Similar deposits............................................... 57 Late Cretaceous or early Eocene gold veins.......................... 57 Distribution and history....................................... 57 Geologic relations................................................ 58 Nature........................................................ 58 - Ores.......................................................... 59 Character.................................................. 59 Relation to depth.......................................... 59 Relation to granite.......................................... 60 Secondary concentration............................... 7 .... 61 Age and genesis............................................... 62 Similar deposits............................................... 63 Lead-silver deposits.................................................... 63 Distribution...................................................... 63 Geologic relations.................................................. 63 Character.......................................................... 64 Ores.............................................................. 64 Mineral character............................................. 64 Oxidation and ground-water level............................... 66 Relation of ores to ground-water level........................... 66 Age and genesis.................................................... 68 Copper deposits........................................................ 69 Distribution....................................................... 69 Geologic relations................................................. 69 Character..................:......................................- 70 Ores............................................................... 70 Age and genesis.................................................... 70 CONTENTS. 5 Ore deposits Continued. Page. Cobalt-nickel deposits.................................................. 71 Distribution...................................................... 71 Geologic relations................................................. 71 Character.......................................................... 71 Ores..........................................:................... 72 Age and genesis.................................................... 72 Tungsten deposits...................................................... 73 Distribution....................................\................. 73 Character......................................................... 73 Ores.............................................................. 73 Genesis............................................................ 73 Tin deposits.......................................................... 74 Mineralogy of Lemhi County ores....................................... 74 General features................................................... 74 Ore minerals...................................................... 74 Oxidation and ground-water level....................................... 80 Age and genesis of the ores, by groups............................'...... 80 Superficial deposits. .................... f .......................... 80 Inclosed deposits................................................... 81 Late Tertiary gold veins....................................... 81 i Late Cretaceous or early Eocene deposits........................ 81 Absence of contact-metamorphic deposits. ............................... 82 Future of mining in Lemhi County.......................................... 82 Mining districts of Lemhi County.......................................... 83 Scheme of treatment................................................... 83 Nicholia district...................................................... 83 History and production............................................ 83 Geology and ore deposits........................................... 84 Spring Mountain district................................................ 85 Situation and access................................................ 85 History and production............................................ 85 Physiography...................................................... 85 Geology.......................................................... 86 Ore deposits.....................................................
Load more

Recommended publications
  • GEM FOCUS August 2020
    GEM FOCUS August 2020 GOLDSTONE, SUNSTONE, AVENTURESCENCE; A SPARKLING ENIGMA OF CENTURIES... emstones with unusual optical effects are know as sunstone feldspar today. Goldstone is cre - defined as phenomenal gems. Their unusual ated by mixing microscopic copper platelets into Geffect can designate a variety within a molten glass. The sheen and earthy color of this species and add value. i.e., star sapphire. Synthetic material was ideal for Italian mosaics and more counterparts or simulants are often seen, especially affordable jewelry, whereas much larger blocks when the natural counterpart is particularly valuable were used to create ornamental objects such as such as natural alexandrite and color change syn - snuff bottles, small bowls or carved figurines. A thetic sapphire. Aventurescence is a phenomenon common story to its origin purports that the Italian caused by light reflecting micro platelets in a gem glass producers discovered this particular effect by and is easily recognizable from the glittering sheen- accident, but when this was is not clear. Accounts like effect. While green mica crystals in quartz cre - of the first production date vary from one source to ates aventurine quartz, hematite and ilmenite crys - another and are stated as from 11th century to 13th tals create the same effect in sunstone feldspar. century. It is true that this rather attractive Murano glass with reddish brown speckles was a popular Out of all the phenomena seen in gems, aventures - and expensive glass production in Italy for many cence, especially the yellow-brown type, has been centuries but it is hard to believe that sunstone the subject of a long-standing discussion.
    [Show full text]
  • Biological Assessment
    TABLE OF CONTENTS 1 INTRODUCTION ........................................................................................................................................ 1 2 BACKGROUND INFORMATION .................................................................................................................... 1 3 PROPOSED ACTION ................................................................................................................................. 2 3.1 Project Area ............................................................................................................................... 2 3.2 Proposed Action ........................................................................................................................ 4 3.2.1 Current Permit ....................................................................................................................... 4 3.2.2 Grazing System ..................................................................................................................... 4 3.2.3 Conservation Measures ........................................................................................................ 5 3.2.4 Changes From Existing Management ................................................................................... 5 3.2.5 Resource Objectives and Standards .................................................................................... 6 3.2.6 Annual Grazing Use indicators .............................................................................................. 7
    [Show full text]
  • Instream Flow Characterization of Upper Salmon River Basin Streams, Central Idaho, 2004
    Prepared in cooperation with the Bureau of Reclamation Instream Flow Characterization of Upper Salmon River Basin Streams, Central Idaho, 2004 Ellis River Challis Fork Salmon Yankee Squaw T h o m Valley p s o n Creek Creek Creek Creek Elk Salmon River Stanley Iron Creek Salmon River Redfish Lake Obsidian July Salmon of Creek Fourth Champion Creek River Alturas Fork Lake Pole Creek Creek East Creek Beaver Smiley Scientific Investigations Report 2005–5212 U.S. Department of the Interior U.S. Geological Survey Instream Flow Characterization of Upper Salmon River Basin Streams, Central Idaho, 2004 By Terry R. Maret, Jon E. Hortness, and Douglas S. Ott Prepared in cooperation with the Bureau of Reclamation Scientific Investigations Report 2005-5212 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior Gale A. Norton, Secretary U.S. Geological Survey P. Patrick Leahy, Acting Director U.S. Geological Survey, Reston, Virginia: 2005 For sale by U.S. Geological Survey, Information Services Box 25286, Denver Federal Center Denver, CO 80225 For more information about the USGS and its products: Telephone: 1-888-ASK-USGS World Wide Web: http://www.usgs.gov/ Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Maret, T.R., Hortness, J.E., and Ott, D.S., 2005, Instream flow characterization of upper Salmon River Basin streams, Central Idaho, 2004: U.S.
    [Show full text]
  • Idaho Mountain Goat Management Plan (2019-2024)
    Idaho Mountain Goat Management Plan 2019-2024 Prepared by IDAHO DEPARTMENT OF FISH AND GAME June 2019 Recommended Citation: Idaho Mountain Goat Management Plan 2019-2024. Idaho Department of Fish and Game, Boise, USA. Team Members: Paul Atwood – Regional Wildlife Biologist Nathan Borg – Regional Wildlife Biologist Clay Hickey – Regional Wildlife Manager Michelle Kemner – Regional Wildlife Biologist Hollie Miyasaki– Wildlife Staff Biologist Morgan Pfander – Regional Wildlife Biologist Jake Powell – Regional Wildlife Biologist Bret Stansberry – Regional Wildlife Biologist Leona Svancara – GIS Analyst Laura Wolf – Team Leader & Regional Wildlife Biologist Contributors: Frances Cassirer – Wildlife Research Biologist Mark Drew – Wildlife Veterinarian Jon Rachael – Wildlife Game Manager Additional copies: Additional copies can be downloaded from the Idaho Department of Fish and Game website at fishandgame.idaho.gov Front Cover Photo: ©Hollie Miyasaki, IDFG Back Cover Photo: ©Laura Wolf, IDFG Idaho Department of Fish and Game (IDFG) adheres to all applicable state and federal laws and regulations related to discrimination on the basis of race, color, national origin, age, gender, disability or veteran’s status. If you feel you have been discriminated against in any program, activity, or facility of IDFG, or if you desire further information, please write to: Idaho Department of Fish and Game, P.O. Box 25, Boise, ID 83707 or U.S. Fish and Wildlife Service, Division of Federal Assistance, Mailstop: MBSP-4020, 4401 N. Fairfax Drive, Arlington, VA 22203, Telephone: (703) 358-2156. This publication will be made available in alternative formats upon request. Please contact IDFG for assistance. Costs associated with this publication are available from IDFG in accordance with Section 60-202, Idaho Code.
    [Show full text]
  • Characterization of Ecoregions of Idaho
    1 0 . C o l u m b i a P l a t e a u 1 3 . C e n t r a l B a s i n a n d R a n g e Ecoregion 10 is an arid grassland and sagebrush steppe that is surrounded by moister, predominantly forested, mountainous ecoregions. It is Ecoregion 13 is internally-drained and composed of north-trending, fault-block ranges and intervening, drier basins. It is vast and includes parts underlain by thick basalt. In the east, where precipitation is greater, deep loess soils have been extensively cultivated for wheat. of Nevada, Utah, California, and Idaho. In Idaho, sagebrush grassland, saltbush–greasewood, mountain brush, and woodland occur; forests are absent unlike in the cooler, wetter, more rugged Ecoregion 19. Grazing is widespread. Cropland is less common than in Ecoregions 12 and 80. Ecoregions of Idaho The unforested hills and plateaus of the Dissected Loess Uplands ecoregion are cut by the canyons of Ecoregion 10l and are disjunct. 10f Pure grasslands dominate lower elevations. Mountain brush grows on higher, moister sites. Grazing and farming have eliminated The arid Shadscale-Dominated Saline Basins ecoregion is nearly flat, internally-drained, and has light-colored alkaline soils that are Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and America into 15 ecological regions. Level II divides the continent into 52 regions Literature Cited: much of the original plant cover. Nevertheless, Ecoregion 10f is not as suited to farming as Ecoregions 10h and 10j because it has thinner soils.
    [Show full text]
  • Geologic Map of the Lemhi Pass Quadrangle, Lemhi County, Idaho
    IDAHO GEOLOGICAL SURVEY IDAHOGEOLOGY.ORG IGS DIGITAL WEB MAP 183 MONTANA BUREAU OF MINES AND GEOLOGY MBMG.MTECH.EDU MBMG OPEN FILE 701 Tuff, undivided (Eocene)—Mixed unit of tuffs interbedded with, and directly Jahnke Lake member, Apple Creek Formation (Mesoproterozoic)—Feldspathic this Cambrian intrusive event introduced the magnetite and REEs. CORRELATION OF MAP UNITS Tt Yajl below, the mafic lava flow unit (Tlm). Equivalent to rhyolitic tuff beds (Tct) quartzite, minor siltite, and argillite. Poorly exposed and only in the Whole-rock geochemical analysis of the syenite indicates enrichment in Y of Staatz (1972), who noted characteristic recessive weathering and a wide northeast corner of the map. Description based mostly on that of Yqpi on (54-89 ppm), Nb (192-218 ppm), Nd (90-119 ppm), La (131-180 ppm), and GEOLOGIC MAP OF THE LEMHI PASS QUADRANGLE, LEMHI COUNTY, IDAHO, AND Artificial Alluvial Deposits Mass-Movement Glacial Deposits and range of crystal, lithic, and vitric fragment (pumice) proportions. Tuffs lower the Kitty Creek map (Lewis and others, 2009) to the north. Fine- to Ce (234-325 ppm) relative to other intrusive rocks in the region (data from Deposits Deposits Periglacial Deposits in the sequence commonly contain conspicuous biotite phenocrysts. Most medium-grained, moderately well-sorted feldspathic quartzite. Typically Gillerman, 2008). Mineralization ages are complex, but some are clearly or all are probably rhyolitic. A quartzite-bearing tuff interbedded with mafic flat-laminated m to dm beds with little siltite or argillite. Plagioclase content m Paleozoic (Gillerman, 2008; Gillerman and others, 2008, 2010, and 2013) Qaf Qas Qgty Qalc Holocene lava flows north of Trail Creek yielded a U-Pb zircon age of 47.0 ± 0.2 Ma (12-28 percent) is greater than or sub-equal to potassium feldspar (5-16 as summarized below.
    [Show full text]
  • Representativeness Assessment of Research Natural Areas on National Forest System Lands in Idaho
    USDA United States Department of Representativeness Assessment of Agriculture Forest Service Research Natural Areas on Rocky Mountain Research Station National Forest System Lands General Technical Report RMRS-GTR-45 in Idaho March 2000 Steven K. Rust Abstract Rust, Steven K. 2000. Representativeness assessment of research natural areas on National Forest System lands in Idaho. Gen. Tech. Rep. RMRS-GTR-45. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 129 p. A representativeness assessment of National Forest System (N FS) Research Natural Areas in ldaho summarizes information on the status of the natural area network and priorities for identification of new Research Natural Areas. Natural distribution and abundance of plant associations is compared to the representation of plant associations within natural areas. Natural distribution and abundance is estimated using modeled potential natural vegetation, published classification and inventory data, and Heritage plant community element occur- rence data. Minimum criteria are applied to select only viable, high quality plant association occurrences. In assigning natural area selection priorities, decision rules are applied to encompass consideration of the adequacy and viability of representation. Selected for analysis were 1,024 plant association occurrences within 21 4 natural areas (including 115 NFS Research Natural Areas). Of the 1,566 combinations of association within ecological sections, 28 percent require additional data for further analysis; 8, 40, and 12 percent, respectively, are ranked from high to low conservation priority; 13 percent are fully represented. Patterns in natural area needs vary between ecological section. The result provides an operational prioritization of Research Natural Area needs at landscape and subregional scales.
    [Show full text]
  • Got a Pocket Full of Sunstone? Maybe Think Twice
    Page 1 of 5 Got a pocket full of Sunstone? Maybe think twice Sunstone falls part of the Feldspar The larger and more abundant the mineral group. It is known for inclusions are, the more exhibiting what is called “Aventurescent” the stone will be “Aventurescence”. and the deeper the golden colour will appear. There are also transparent Sunstones from Oregon in the USA. They are often green and/or red in colour, with small copper inclusions (often in “streams”) creating a Aventurescence is a type of “Schiller” effect. iridescence (a play-of-colour) that is caused by the reflection of small, thin and platy inclusions - copper, goethite and/or hematite in the case of Sunstone - that are spread in a parallel orientation through the gem. This causes interference of light between the layers of platelets which creates the glittery sheen associated with Sunstone (see image on the above right). Kaylan Khourie, FGA All rights reserved. 08/09/2019 Page 2 of 5 Sunstone falls into three species Sunstone can fall into three species of the Feldspar group: Orthoclase, Oligoclase and Labradorite (this is also into where the Oregon material falls). Orthoclase falls under the “Alkali Feldspar” category whereas Oligoclase and Labradorite fall under the “Plagioclase Feldspar” category. Below is a table of each species of Sunstone and some of their properties: Specific Refractive Species Chemical Composition Birefringence Gravity Index Orthoclase KAlSi₃O₈ 2.58 1.518 - 1.526 0.005 -0.008 Solid solution between Oligoclase 2.65 1.539 - 1.547 0.007 - 0.010 NaAlSi₃O₈ and CaAlSi₂O₈ Solid solution between Labradorite 2.70 1.559 - 1.568 0.007 - 0.010 NaAlSi₃O₈ and CaAlSi₂O₈ ↳ Oregon Solid solution between 2.67 - 2.72 1.563 - 1.572 0.009 material NaAlSi₃O₈ and CaAlSi₂O₈ However, the gems being marketed as “Sunstone” are almost always pieces of man-made glass containing an abundance of tiny copper inclusions.
    [Show full text]
  • National Register of Historic Places Multiple Property Documentation Form
    NPSForm10-900-b JX1*^V\X' \ \ 0MB No. 10024-0018 (Juno 1991) United States Department of the Interior National Park Service National Register of Historic Places Multiple Property Documentation Form This form is used for documenting multiple property groups relating to one or several historic contexts. See instructions in How to Complete the Multiple Property Documentation Form (National Register Bulletin 16B). Complete each item by entering the requested information. For additional space, use continuation sheets (NFS Form 10-900a). Use a typewriter, word processor, or computer to complete all items. X New Submission Amended Submission A. Name of Multiple Property Listing Historic Resources of the Elk City Wagon Road B. Associated Historic Contexts (Name each associated historic context, identifying theme, geographical area, and chronological period for each.) Transportation along the Elk City Transportation Corridor, Harpster to Elk City, 1894-1932 C. Form Prepared By name/title Dale M. Gray organization Frontier Historical Consultants date September 1. 1999 street & number HC 86, Box 211 telephone (208)834-3061 city or town Grandview state Idaho zip code 83719-0654 D. State/Federal Agency Certification As the designated authority under the National Hfetorfc Preservation Ad of 1966, as amerKted^^ setefbflhrequirerne^forthelist^ This submission meets tte procedural^ 60 and the-Secretary of the Interiofs^tandafds and/Gujdelines^or Archeology and Historic Preservation. [ ] See continuation sheet for additional comments.) Signature of certifying official/Title Hf?teN Date State or Federal agency and bureau NPS Form 10-900-a OMB Approval No. 1024-0018 (8-86) United States Department of the Interior National Park Service National Register of Historic Places Continuation Sheet Section number E___ Page 1 Statement of Historic Context From 1895 to 1932, the Elk City Wagon Road provided a vital route for wheeled traffic into the rugged Clearwater Mountains in north central Idaho.
    [Show full text]
  • Rnas of Clearwater and Nez Perce National Forests:Layout 1
    Established and Proposed Research Natural Areas in the Clearwater and Nez Perce National Forests An FOC preliminary report April 2012 Fred W. Rabe Research Natural Areas in the Clearwater and Nez Perce Lochsa RNA, located on two sides of the Lochsa River, is 1281 acres in size. It National Forests occupies a refugium within which coastal species have survived in isolation since the Pliocene epoch and uplift of the Cascade Mountains. The flowering dogwood Fred W. Rabe and red alder are featured species there. Three permanent high energy streams dissect the steep slopes and the dense canopy and deep pools contribute to the The Forest Service, Bureau of Land Management, Fish and Wildlife Service and high diversity and biointegrity of macroinvertebrates in Apgar and Glade National Park Service permanently protect some of the finest examples of natu- Creek.The site is adjacent to Apgar and Glade Creek Campgrounds. An FOC ral ecosystems as Research Natural Areas (RNA), the Forest Service most active workshop occurred here in 2011. in this endeavor. The purpose of RNAs is to use them in scientific studies and educational activi- ties. They provide for the protection of biological diversity at the species, ecosys- tem and landscape levels. RNAs also serve as reference areas or controls when baseline monitoring occurs. Natural history studies and educational use by native plant societies and environmental groups continues to occur in the Clearwater and Nez Perce National Forests. Clearwater National Forest RNAs Collecting macroinvertebrates in Sneakfoot Meadows RNA is 6,000 ft elevation and occupies a flat glaciated basin . Apgar Creek - FOC workshop.
    [Show full text]
  • Irrigation and Streamflow Depletion in Columbia River Basin Above the Dalles, Oregon
    Irrigation and Streamflow Depletion in Columbia River Basin above The Dalles, Oregon Bv W. D. SIMONS GEOLOGICAL SURVEY WATER-SUPPLY PAPER 1220 An evaluation of the consumptive use of water based on the amount of irrigation UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1953 UNITED STATES DEPARTMENT OF THE INTERIOR Douglas McKay, Secretary GEOLOGICAL SURVEY W. E. Wrather, Director For sale by the Superintendent of Documents, U. S. Government Printing Office Washington 25, D. C. - Price 50 cents (paper cover) CONTENTS Page Abstract................................................................................................................................. 1 Introduction........................................................................................................................... 2 Purpose and scope....................................................................................................... 2 Acknowledgments......................................................................................................... 3 Irrigation in the basin......................................................................................................... 3 Historical summary...................................................................................................... 3 Legislation................................................................................................................... 6 Records and sources for data..................................................................................... 8 Stream
    [Show full text]
  • Clearwater Rapid Watershed Assessment
    Clearwater - 17060306 Idaho 8 Digit Hydrologic Unit Profile December 2006 Tensed Farmington Clearwater - 17060306 8-Digit Hydrologic Unit LATAHLATAH Location Map Potlatch Bovill WHITMAN WHITMAN Deary (Washington) (Washington) Elk River Troy Moscow CLEARWATERCLEARWATER Kendrick Juliaetta Genesee Pierce Clearwater Peck Orofino Clarkston 17060306 Lapwai Culdesac Weippe Lewiston Asotin Reubens LEWISLEWIS Kamiah Craigmont Winchester Nezperce Kooskia Ferdinand NEZNEZ Stites PERCEPERCE Cottonwood !COEUR d ALENE MOSCOW! IDAHOIDAHO Grangeville LEWISTON! !REXBURG CALDWELL! !BOISE NAMPA! !IDAHO FALLS : BLACKFOOT ! !POCATELLO 0 5 10 15 20 25 TWIN! FALLS Miles The United States Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, sex, religion, age, disability, political beliefs, sexual orientation, and marital or family status. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at 202-720-2600 (voice and TDD). To file a complaint of discrimination, write USDA, Director, Office of Civil Rights, Room 326W, Whitten Building, 14 th and Independence Avenue, SW, Washington DC 20250-9410 or call (202) 720-5964 (voice and TDD). USDA is an equal opportunity provider and employer. 1 Clearwater - 17060306 Idaho 8 Digit Hydrologic Unit Profile December 2006 Introduction The Clearwater 8-Digit Hydrologic Unit Code (HUC) subbasin is 1,503,992 acres. Clearwater and Nez Perce counties each account for approximately 24 percent of the subbasin. Twenty two percent of the subbasin is in Latah County, 18 percent in Lewis County, 13 percent in Idaho County and less than 0.5% in Whitman County, Washington.
    [Show full text]