DOCSLIB.ORG

Landslide Occurrence in the Elk and Sixes River Basins, Southwest Oregon

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Landslide Occurrence in the Elk and Sixes River Basins, Southwest Oregon AN ABSTRACT OF THE THESIS OF Margaret H. McHugh for the degree of Master of Science in Geology presented on December 10, 1986 Title: Landslide Occurrence in the Elk and SixesRiver Basins, Southwest Oregon Redacted for Privacy Abstract approved: Dr. Frederick J. Swanson Timber management of coastal watersheds insouthwest Oregon has been complicated by the need toprotect anadromous fish habitat from accelerated stream sedimentation resultingfrom management activity. The rugged terrain of the Elk and SixesRiver basins is underlain by the complex geological province of theKlamath Mountains, in which landslides are a common, natural, andimportant process of sediment production. A landslide investigation, using sequentialaerial photographs which covered a time period of 37years, was used to determine relationships between mass-wasting, geologictypes, and timber harvest practices. Averaged over all rock types, harvestedareas showed an increase in failure rate of 7 times, and roadedareas an increase of 48 times that of forested terrain. Terrane underlain by dioritic intrusions was the most sensitiveto road-related activity, with an increase in failure rate of up to 108 times that ofcomparable unmanaged land. The complexity of lithologies and deformational historyin the area strongly influence slope morphology, and produces characteristic soil types which experience predictable modes andrates of slope failure. Debris slides and torrents are the dominant formof mass-wasting in dioritic and Cretaceous sedimentaryterrane. Areas underlain by more clay-rich metamorphic bedrockare prone to slumps and planar streambank failures. Stream morphology is profoundly influenced byboth rock type and geologic structure. Within an area characterized bysteep, deeply incised streams, several persistent low-gradientreaches were delineated. These low-gradient stream reachesoccur where (1) large landslides have locally raised channel bedelevation and (2) valley-floor widening has occurred in shearedrocks along fault zones or in more readily eroded rock types upstream ofrock types resistant to fluvial erosion. Landslide Occurrence in the Elk and SixesRiver Basins, Southwest Oregon by Margaret H. McHugh A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Master of Science Completed December 10, 1986 Commencement June 1987 APPROVED: Redacted for Privacy Professor of Geology incharge of major Redacted for Privacy Departm t r-....) Redacted for Privacy Dean of Gradua School 0 Date thesis is presented December 10, 1986 ACKNOWLEDGMENTS I gratefully acknowledge the impetusand financial support given to me for this study by the USDA Forest Servicethrough the Siskiyou National Forest, from both the Supervisor'sOffice and the Powers Ranger District. Equipment and use of facilitieswere also generously provided by the Pacific Northwest ResearchStation, Westside Engineering Zone, and the State of OregonElk River Fish Hatchery. A special thanks is due Dr. FrederickSwanson, for encouragingme to continue his landslide investigationin the Elk and Sixes River basins. He has the ability to expand hisstudents' perspective without a loss of focus. I am grateful for his vision, faithand steadfast support. I am also grateful to my othercommittee members for their interest and editorialassistance; Drs. Robert Beschta, Allen Agnew, and Robert Phelps. For my partner in crimeon this project, Michelle McSwain, thank you for memories of two great summers in the field. I would also like to acknowledge the support and patienceof my wonderful children. My son, Ian Farquhar, especially deserves creditfor the hard work and protection he gave as my field assistant. Above all, I wish to thank my parents, Lawrence and Catherine McHugh, forgiving me a love of learning, and geology, anda confidence in my own abilities. TABLE OF CONTENTS INTRODUCTION 1 STUDY AREA 3 Location and Access 3 Topography 3 Precipitation 3 Runoff and Streamflow 6 Geology 6 Vegetation 9 Management History 9 REVIEW OF GEOLOGIC LITERATURE 10 REGIONAL GEOLOGY 10 PREVIOUS MAPPING 10 TECTONIC SETTING 11 LITHOLOGY 14 Galice Formation (Late Jurassic) 14 Definition 14 Description 14 Age and correlation 15 Colebrooke Formation (Jurassic) 15 Definition 15 Description 15 Age and correlation 16 Mafic and Intrusive Rocks 16 Description 16 Age and correlation 17 Otter Point Formation (Latest Jurassic) 17 Definition 17 Description 18 Age and correlation 18 Humbug Mountain Conglomerate (EarlyCretaceous) 19 Definition 19 Description 19 Age and correlation 20 Rocky Point Formation (Early Cretaceous) 20 Definition 20 Description 21 Age and correlation 21 LANDSLIDE INVESTIGATION 22 GEOTECHNICAL REVIEW 22 Use of Aerial Photography for Landslide Investigation 22 Landslide Definitions 23 METHODS OF INVESTIGATION 25 Aerial Photography Investigation 25 Field Investigation 27 Survey of failures under forestcover 28 Hydrologic data 29 RESULTS 32 DATABASE COMPLIATION 32 Landslide Area to Volume Measurements 33 FAILURE RATES 36 Previous Studies 36 Failure Rate by Rock Type and Site Condition 38 Failure Rate by Rock Type, Site Condition and Time 40 Failure Response Time to ManagementActivity 44 Timing of Failure Response in TimberHarvest Units 44 Failure Rate by Landform Classification 46 Sedimentary terrane 48 Metamorphic terrane 48 Igneous intrusive terrane 51 Landslide Volume Estimates 51 Soil transfer rates 55 GEOMORPHOLOGY AND GEOLOGY 57 INFLUENCE OF STRUCTURE ON MASS WASTING 57 Debris Slides and Surface Ravel 57 INFLUENCE OF STRUCTURE ON STREAM MORPHOLOGY 60 Faults 61 Folds 61 EFFECT OF LITHOLOGY ON MASS WASTINGPROCESSES 62 Failure Types 62 Jurassic sedimentary terrane 62 Igneous intrusive terrane 66 Jurassic metamorphic terrane 67 Cretaceous sedimentary terrane 69 Humbug Mountain Conglomerate 70 Rocky Point Formation 70 Streambank failures 72 EFFECTS OF BEDROCK ON STREAM MORPHOLOGY 73 Channel Incision and Sinuosity 73 Channel Gradient 74 Failure Type and Sediment Delivery 75 Low-gradient Stream Reaches 77 Mainstem, Panther Creek 77 North Fork, Elk River 79 SUMMARY 81 LITERATURE CITED 85 OTHER REFERENCES 88 APPENDIX 89 LIST OF FIGURES Figure Page 1. Location map 4 2. Isohyetal map 5 3. Legend andgeologic map 7 4. Landslide inventory maps pocket 5. Flood recurrence intervals for events >850cms, 31 SouthFork Coquille River,Powers, OR: 1944-1980 6. Log plot of regression-developed equationsfor 35 area-to-volume relationships 7. Failure rate by geologic terrane. 39 8. Failure rate by time, rock type, and sitecondition. 42 9. Histories of management (clear-cut plusroads) and 45 failure rate by geologic terrane 10. Percent of failures which have occurred byyears 47 after harvest 11. Failure rate by landform classificationand site 49 condition; rates relative to unmanaged sites. 12. Volume of debris produced through timefrom land- 53 slides; classified by rock type and sitecondition. 13. Volume of landslide debris estimatedto have reached 54 streams third-order or greater; classified by rock type and site condition. 14. Structural overlay of Butler Creek ravelsites. 59 15. Sketch and description of Failure Type 1 63 16. Sketch and description of Failure Type 2 64 17. Sketch and description of FailureType 3 65 18. Low-gradient stream reaches andareas of high 78 salmonid production. A-1 Landslide photo-data sheet 91 A-2 Landslide field-data sheet 92 A-3 Landslide timing in clearcut units 96 A-4 Failure rate in sedimentaryterrane by landform 98 classification and site condition A-5 Failure rate in metamorphicterrane by landform 100 classification and site condition A-6 Failure rate in igneous intrusiveterrane by 102 landform classification and sitecondition A-7 Pi diagram of non-plunging, non-cylindrical fold 104 trending approximately N43E A-8 Beta diagram of joint intersectionmaxima 105 A-9 Beta diagrams of ravel chute lineations 106 LIST OF TABLES 1. Aerial photograph availability for the Elk 26 and Sixes River basins 2. Peak flows >850 cms, S. Fork CoquilleRiver, 30 Powers, OR: 1944-1980 3. Comparison between photo- and field-measured 34 relationships, from Amaranthus (1985) 4. Comparison of failure rates from studies inthe 37 Pacific Northwest 5. Failure rate by rock type and sitecondition 41 6. Failure rate for all rock types instudy area, 43 calculated for three time periods 7. Failure rate by landform classificationand site 50 condition; adjusted by percent of totalarea in landclass 8. Comparison of soil transfer rates in thePacific 56 Northwest, from Swanson (1981) A-1 Database: table of codes 89 A-2 Failure rate for sedimentaryterrane 93 A-3 Failure rate for metamorphicterrane 94 A-4 Failure rate for igneous intrusiveterrane 95 A-5 Chi-squared test for goodness-of-fit forfailure 97 frequency by landform classes A-6 Failure rates in sedimentaryterrane by landform 99 classification and site condition A-7 Failure rates in metamorphicterrane by landform 101 classification and site condition A-8 Failure rates in igneous intrusiveterrane by land- 103 form classification and site condition LANDSLIDE OCCURRENCE IN THE ELK AND SIXESRIVER BASINS, SOUTHWEST OREGON INTRODUCTION Landslides are a common and naturalcomponent of the erosional processes in the Klamath Mountains of southwestOregon. Debris slides are an important form of mass wasting in thearea and are a significant source of sedimentto steep drainages. The Elk and Sixes River basins are underlain bya complex geological terrane which has been tectonically active in therecent past. This has contributed to the development of high reliefand
Load more

Recommended publications
  • DOGAMI GMS-5, Geology of the Powers Quadrangle, Oregon
    o thickness of about 1,500 feet. The southern outcrop terminates against the Sixes River fault, indicat­ Intermediate intrusive rocks, mainly diorite and quartz diorite, intrude the Gal ice Formation ing that the last movement involved down-faulting along the north side. south of the Sixes River fault. One stock, covering nearly 2 square miles, is bisected by Benson Creek, Megafossils are present in some of the bedded basal sandstone. Forominifera examined by W. W. and numerous small dikes are present nearby. One of the largest dikes extends from Rusty Creek eastward Rau (Baldwin, 1965) collected a short distance west of the mouth of Big Creek along the Sixes River were through the Middle Fork of the Sixes River into Salman Mountain. These intrusive racks are described by assigned a middle Eocene age . A middle Eocene microfauna in beds of similar age near Powers was ex­ Lund and Baldwin ( 1969) and are correlated with the Pearse Peak diorite of Koch ( 1966). The Pearse amined by Thoms (Born, 1963), and another outcrop along Fourmile Creek to the north contained a mid­ Peak body, which intrudes the Ga lice Formation along Elk River to the south, is described by Koch (1966, GEOLOGICAL MAP SERIES dle Eocene molluscan fauna (Allen and Baldwin, 1944). Phillips (1968) also collected o middle Eocene p. 51-52) . fauna in middle Umpqua strata along Fourmile Creek, o short distance north of the mapped area. Lode gold deposits reported by Brooks and Ramp ( 1968) in the South Fork of the Sixes drainage and on Rusty Butte are apparently associated with the dioritic intrusive bodies.
    [Show full text]
  • A Bibliography of Klamath Mountains Geology, California and Oregon
    U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY A bibliography of Klamath Mountains geology, California and Oregon, listing authors from Aalto to Zucca for the years 1849 to mid-1995 Compiled by William P. Irwin Menlo Park, California Open-File Report 95-558 1995 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards (or with the North American Stratigraphic Code). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. PREFACE This bibliography of Klamath Mountains geology was begun, although not in a systematic or comprehensive way, when, in 1953, I was assigned the task of preparing a report on the geology and mineral resources of the drainage basins of the Trinity, Klamath, and Eel Rivers in northwestern California. During the following 40 or more years, I maintained an active interest in the Klamath Mountains region and continued to collect bibliographic references to the various reports and maps of Klamath geology that came to my attention. When I retired in 1989 and became a Geologist Emeritus with the Geological Survey, I had a large amount of bibliographic material in my files. Believing that a comprehensive bibliography of a region is a valuable research tool, I have expended substantial effort to make this bibliography of the Klamath Mountains as complete as is reasonably feasible. My aim was to include all published reports and maps that pertain primarily to the Klamath Mountains, as well as all pertinent doctoral and master's theses.
    [Show full text]
  • Types of Landslides.Indd
    Landslide Types and Processes andslides in the United States occur in all 50 States. The primary regions of landslide occurrence and potential are the coastal and mountainous areas of California, Oregon, Land Washington, the States comprising the intermountain west, and the mountainous and hilly regions of the Eastern United States. Alaska and Hawaii also experience all types of landslides. Landslides in the United States cause approximately $3.5 billion (year 2001 dollars) in dam- age, and kill between 25 and 50 people annually. Casualties in the United States are primar- ily caused by rockfalls, rock slides, and debris flows. Worldwide, landslides occur and cause thousands of casualties and billions in monetary losses annually. The information in this publication provides an introductory primer on understanding basic scientific facts about landslides—the different types of landslides, how they are initiated, and some basic information about how they can begin to be managed as a hazard. TYPES OF LANDSLIDES porate additional variables, such as the rate of movement and the water, air, or ice content of The term “landslide” describes a wide variety the landslide material. of processes that result in the downward and outward movement of slope-forming materials Although landslides are primarily associ- including rock, soil, artificial fill, or a com- ated with mountainous regions, they can bination of these. The materials may move also occur in areas of generally low relief. In by falling, toppling, sliding, spreading, or low-relief areas, landslides occur as cut-and- La Conchita, coastal area of southern Califor- flowing. Figure 1 shows a graphic illustration fill failures (roadway and building excava- nia.
    [Show full text]
  • South Fork Coquille Watershed Analysis
    DOCUMENT A 13.66/2: COQUILLE fiVE, LOWER S.F. 17 10 03 00* I C 66x 1 COQUILLE RIVER, UPPER S.F 17 1:-03 01* ' United States Q, '0) Departimnt of Agriculture THIS PUBLICATION Forest Serilce CMN FE CHECKED OUT Pacific Northwest Region 1995 JA* fSouth Fork Coquille Wate1hed Analysis Iteration 1.0 Powers Ranger Distric, Slsklyou National Forest September 1995 SOUTHERN OREGON UNWVERSiTY LIBRARY ASHLAND, OREGON 97520 United Stat. Depaenent of Agnculure Forest Service Pacific Northwest Region 1995 SOUTH FORK COQUILLE WATERSHED ANALYSIS ITERATION 1.0 I have read this analysis and it meets the Standards and Guidelines for watershed analysis required by an amendment to the Forest Plan (Record of Decision dated April 1994). Any additional evidence needed to make a decision will be gathered site-specifically as part of a NEPA document or as an update to this document. SIGNED CoQ 4 DATE q 1T2 letE District Ranger Powers Ranger District Siskiyou National Forest South Fork Coquille Watershed Analysis - September 1995 Developed by Interdisciplinary Team Members: Steve Harbert Team leader Betsy Howell Wildlife Biologist Dave Shea Botantist, Wildlife Biologist Ruth Sisko Forester Cindy Ricks Geologist Chris Parks Hydrologist Max Yager Fish Biologist Kathy Helm Writer-Editor (March-April 1995), BLM Tina Harbert Writer-Editor (May-July 1995), Powers R.D. Joe Hallett Cultural Resource Key Support: Joel King Forest Planner, Siskiyou National Forest Sue Olson Acting District Ranger, Powers R.D. (Jan-May 1995) Carl Linderman District Ranger, Powers R.D. Marshall Foster GIS, Powers R.D. Jodi Shorb Computer Assistant Linda Spencer Computer Support For Further Information, contact: Powers Ranger District Powers, OR 97466 (503) 439-3011 The policy of the United States Department of Agriculture Forest Service prohibits discrimination on the basis of race, color, national origin, age, religion, sex, or disability, familial status, or political affiliation.
    [Show full text]
  • Engineering Geologic Assessment of the Slope Movements And
    EGU Journal Logos (RGB) Open Access Open Access Open Access Advances in Annales Nonlinear Processes Geosciences Geophysicae in Geophysics Open Access Open Access Nat. Hazards Earth Syst. Sci., 13, 1113–1126, 2013 Natural Hazards Natural Hazards www.nat-hazards-earth-syst-sci.net/13/1113/2013/ doi:10.5194/nhess-13-1113-2013 and Earth System and Earth System © Author(s) 2013. CC Attribution 3.0 License. Sciences Sciences Discussions Open Access Open Access Atmospheric Atmospheric Chemistry Chemistry and Physics and Physics Engineering geologic assessment of the slope movements and Discussions Open Access Open Access liquefaction failures of the 23 October 2011 Van earthquakeAtmospheric Atmospheric Measurement Measurement M = ( w 7.2) Techniques Techniques A. Karakas¸, O.¨ Coruk, and B. Dogan˘ Discussions Open Access Open Access Kocaeli University, Engineering Faculty, Department of Geological Engineering, Izmit,˙ Kocaeli, Turkey Biogeosciences Correspondence to: A. Karakas¸([email protected]) Biogeosciences Discussions Received: 30 October 2012 – Published in Nat. Hazards Earth Syst. Sci. Discuss.: – Revised: 29 January 2013 – Accepted: 18 April 2013 – Published: 26 April 2013 Open Access Open Access Climate Climate Abstract. On 23 October 2011, a M = 7.2 earthquake oc- 1 Introduction w of the Past of the Past curred in the Van Province in eastern Turkey, killing 604 peo- Discussions ple. The earthquake was triggered by a thrust fault due to a Earthquakes are natural events that have different effects on compression stress in the region, and caused extensive dam- the earth. Some effects severely affect humans, man-made Open Access Open Access age over a large area. Many structures in the earthquake re- structures, and nature.
    [Show full text]
  • Ore Bin / Oregon Geology Magazine / Journal
    The ORE BIN Volume 24, No.8 August, 1962 GEOLOGY OF THE CAPE BLANCO AREA, SOUTHWEST OREGON By R. H. Dott, Jr. * Introduction Cape Blanco, the most westerly headland in Oregon, encompasses some critical geological relationships important to the understanding of the western Klamath-Siskiyou region. The cape was named by 16th century Spanish sailors, as were many other Oregon headlands such as Cape Se­ bastian and Cape Ferrelo. Figure 1 shows the location of the Cape Blanco area, which includes also Blacklock Point, lying 3 miles to the northeast within the undeveloped Newburgh State Park. Cape Blanco and Blacklock Point lie along the northwest landward end of a great sheared zone which is at least one mile wide. Though Ce­ nozoic deposits mask most of the region to the east and south, the zone is considered co-extensive with the previously named Port Orford shear zone exposed 8 miles southeast of the cape (Koch and others, 1961). This is one of a series of such zones which lace the southwest Oregon coast just as they do in the northern California Coast Ranges (figure 1). The bedrock types and ages exposed in the area are extremely varied, ranging from the Dothan? Formation of uncertain but presumably Jurassic age to extensive Cenozoic deposits. Particularly noteworthy is the rec­ ognition of Late Cretaceous strata north of Blacklock Point (Koch and others, 1961). These, together with the Dothan? Formation and rocks in Cape Blanco, were all mapped as the "Myrtle formation" by Diller (1903). Only those in Cape Blanco are here regarded as representing true equiv­ alents of the Myrtle Group as defined by Imlay and others (1959).
    [Show full text]
  • Mass Movements General Anatomy
    CE/SC 10110-20110: Planet Earth Mass Movements Earth Portrait of a Planet Fifth Edition Chapter 16 Mass movement (or mass wasting) is the downslope motion of rock, regolith (soil, sediment, and debris), snow, and ice. General Anatomy Discrete slump blocks Head scarp Bulging toe Road for scale Disaster in the Andes: Yungay, Peru, 1970 Fractures rock, loosens soil particles. Seismic energy overstresses the system. Yungay, Peru, in the Santa River Valley beneath the heavily glaciated Nevado Huascarán (21,860 feet). May, 1970, earthquake occurred offshore ~100 km away - triggered many small rock falls. An 800-meter-wide block of ice was dislodged and avalanched downhill, scooping out small lakes and breaking off large masses of rock debris. Disaster in the Andes: Yungay, Peru, 1970 More than 50 million cubic meters of muddy debris traveled 3.7 km (12,000 feet) vertically and 14.5 km (9 miles) horizontally in less than 4 minutes! Main mass of material traveled down a steep valley, blocking the Santa River and burying ~18,000 people in Ranrachirca. A small part shot up the valley wall, was momentarily airborne before burying the village of Yungay. Estimated death toll = 17,000. Disaster in the Andes: Yungay, Peru, 1970 Before After Whats Left of Yungay. Common Mass Movements Rockfalls and Slides Slow Fast Debris Flows Slumping Lahars and Mudflows Solifluction and Creep These different kinds of mass movements are arranged from slowest (left) to fastest (right). Types of Mass Movement Different types of mass movement based on 4 factors: 1) Type of material involved (rock, regolith, snow, ice); 2) Velocity of the movement (slow, intermediate, fast); 3) Character of the movement (chaotic cloud, slurry, coherent mass; 4) Environment (subaerial, submarine).
    [Show full text]
  • National Register of Historic Places Continuation Sheet
    NP8 POrm 1MM« QMf Appro*! No. TOM40M (MO) United States Department of the Interior National Park Service National Register of Historic Places Continuation Sheet Section number ___ Page ___ SUPPLEMENTARY LISTING RECORD NRIS Reference Number: 92001325 Date Listed: 10/22/92 Sixes Hotel Curry OR Property Name: County: State: Multiple Name This property is listed in the National Register of Historic Places in accordance with the attached nomination documentation subject to the following exceptions, exclusions, or amendments, notwithstanding the National Park Service certification included in the nomination documentation. / . of the Keeper ___ Date of Action Amended Items in Nomination: A clarification of the materials of the Sixes Hotel was made through a phone call to the Oregon SHPO. The foundation is concrete, the exterior is clad with raked cedar shingles, and the roof is surfaced with asphalt. In addition, Criteria Consideration "b" should be added because the property was moved within the period of significance. The nomination is officially amended to include this information. DISTRIBUTION: National Register property file Nominating Authority (without nomination attachment) NPS Form 10-900 M rOMB No. 10024-0018 (Oct. 1990) L*'Ur1 I n 1 United States Department of the Interior National Park Service National Register of Historic Places Registration Form This form is for use in nominating or requesting determinations for individual properties and districts. See instructions in. How to Complete the National Register of Historic Places Registration Form (National Register Bulletin 16A). Complete each item by marking "x" in the appropriate box or by entering the information requested. If an item does not apply to the property being documented, enter "N/A" for "not applicable." For functions, architectural classification, materials, and areas of significance, enter only categories and subcategories from the instructions.
    [Show full text]
  • Gold Beach – Rural Tourism Studio
    GOLD BEACH – RURAL TOURISM STUDIO NETWORKING EVENT Monday May 6, 2013 PARTICIPANTS Sue Baczik, Ellensburg Theater Doug Brand, Gold Beach City Council Laurie Brand, By My Hand Alexa Carey, Rogue Outdoor Bob Chibante, Gold Beach Chamber Candy Cronberger, City of Gold Beach Ron Crook, Event Center Sue Dawson, Gold Beach Visitor Center Jessica Delaney, Curry Community Health Jodi Fritts, City of Gold Beach Amy Gaddis Larry Hammer, Pound Hammer Media Marcus Hinz, OCVA Harry Hoogesteger, South Coast Watersheds Katherine Hoppe, Coos Bay/N Bend VCB Yan Huang, Curry County Kim Hunter, US Forest Service Jamie Kaufman Annette Klinefelder, CCACON Development Dave Lacey, South Coast Tours Tina Lanier, USDA Forest Service Jamie Lundin, Harbor View Cottages Bill Matthey, Fort of GB and Chamber Nic McNair, Jerry’s Rogue Jets Scott McNeir, Jerry’s Rogue Jets Georgia Nowlin, Brandy Peak Distillery Barb Repp Raynes, ETC Karen Richmond Sandy Vieira, Gold Beach Chamber Cindy Vosburg, Pilot Rick Vosburg Mureen Walker, Curry County Fair Wild Rivers Coast Rural Tourism Studio Networking Notes, May 6-9, 2013 1 Notes from participants: Tourism was a four letter word o Nobody wanted to admit how important it was to the region o Acknowledgement that it is now an integral part of the economy o Start looking ahead Anti-Tourism sentiment by locals Tourism is an asset that buoys other business efforts Old Guard vs: New Guard “Everybody wants this but no one knows how to get there” Need a central information source Online space needed There is a local dolphin population
    [Show full text]
  • New River, Sixes River, Elk River, and Euchre Creek Tidal Wetlands Assessment
    New River, Sixes River, Elk River, and Euchre Creek Tidal Wetlands Assessment September 20, 2016 In partial Fulfillment of requirements of OWEB grant #214-2050 Prepared for the South Coast Watershed Council Cindy Ricks Myers Curry Watersheds Water Quality Monitoring Program [email protected] With Assistance by Ken Bierly, Bierly & Associates New River, Sixes River, Elk River, and Euchre Creek Tidal Wetlands Assessment Contents INTRODUCTION ................................................................................................................................................. 1 Background .................................................................................................................................................... 1 Purpose .......................................................................................................................................................... 1 Project Objectives .......................................................................................................................................... 3 Study Area ..................................................................................................................................................... 3 Assessment Methodologies ......................................................................................................................... 6 SOUTH COAST ESTUARIES ................................................................................................................................ 7 New River
    [Show full text]
  • Effects of Earthflows on Stream Channel and Valley Floor
    AN ABSTRACT OF THE THESIS OF Sarah B. Vest for the degree of Master of Science in Geology presented on January 12, 1988 Title: Effects of Earthflowson Stream Channel and Valley Floor Morphology, Western Cascade Range, Oregon Redacted for privacy Abstract approved: Frederick J. Swanson Slow moving earthflows (0.1 15 m/yr.) may constrict valley floors and directly impingeon stream channels. Earthflows that move laterally into channels deliver organic andinorganic material to the stream from the earthflow toe. If the amount and particle size of this material is too largeto be removed by streamflow, aggradation and subsequent steepening ofthe channel gradient occur. However, if the rate of material input istoo slow or the size of material is too small, the materialcan be removed as bedload or suspended sediment load andthere will be no change in gradient. Where earthflow encroachmentcauses channel aggradation, the valley floor and channel upstream of thezone of direct earthflow constriction experiences widening anddecrease in the gradient of the valley floor and channel. This increase in width of the channel is due to the gradient changein the earthflow-constricted zone and to hydraulic backwatereffects at stream flows which carry bedload. Effects of the earthflowconstriction at five sites in the western Cascade Range of Oregonare examined at two scales 1) that 2 3 of stream reaches (10 to 10 meters of channel length inareas having similiar valley floorcharacteristics) and 2) that of channel units (features which are 1to 10 channel widths in length,e.g. pools, riffles and cascades). In earthflow-constricted reaches (defined by length of the earthflowtoe entering the channel) where channel gradient is steepest,there is a greater percentage of cascades per unit of reach length.
    [Show full text]
  • Curry County Coos Count
    CURRY COUNTY COOS COUNT , 31 DOUGLAS COUNTY 3D port Drfor io.. Marini U 33 4 .k" A 34 Ft 2- In F2 0 op 0 <, `." O 1.41, IV 6,1 0 burn orpentervilie GOLD BEACH CC k!8 • 14 13 4 1I a 12 10 !DEL NORTE COUNTY, CALIFORNIA Curry County Port Orford Don H. Byrd (1996) Oregon Burial Site Guide Curry County Area: 1,648 square miles Population (1998): 21,157 County seat: Gold Beach, Population: 2,115 County established: 18 December 1855 Cemeteries were established after permanent settlement began in 1854. Public cemeteries were established at Port Orford (1854) and the Pioneer Cemetery at Gold Beach (1859). Settlement was slow until the 1930s. Rogue River Dean II. Byrd (1996) 217 Oregon Burial Site Guide Curry County 218 Oregon Bural Site Guide Curry County Name of Cemetery and also known as I Number of Neils I Acres I [menial pate started or earliest Imam burial 1 Township I 'tense I Section ARMPRIEST FAMILY A ? 5 1880 T36S R12W UNS This section is unsurveyed but is projected as Section 13. The Armpriest family is supposed to be located at Armpriest Prairie. NOTE: There is no Armpriest Prairie listed by USGS. There is a camp known as Brandon Camp shown in this area however. The camp is within the Siskiyou National Forest and is reached by Trail #1169. No other information was given in the report. (Not shown on Horse Sign Butte 1989 USGS Quad. map.) BALD RIDGE A ? 5 1917 T33S R9W S8 AKA: 1. CRITESER, MAY Mrs. Wooldridge reported at least two known burials near the airstrip.
    [Show full text]