DOCSLIB.ORG

Geology and Petrology of the Basalts of Crater Flat: Applications to Volcanic Risk Assessment for the Nevada Nuclear Waste Storage Investigations

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Geology and Petrology of the Basalts of Crater Flat: Applications to Volcanic Risk Assessment for the Nevada Nuclear Waste Storage Investigations t^6 O_ LA-8845-MS Geology and Petrology of the Basalts of Crater Flat: Applications to Volcanic Risk Assessment for the Nevada Nuclear Waste Storage Investigations * _ o %._- co.. 0 ._ aj) ._= LOS ALAMOS SCIENTIFIC LABORATORY Post Office B0x 1663 Los Alamos. New Mexico 87545 I,; I~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I I An Affrmative Action/Equal Opportunity Employer This work was supported by the US Depart. ment of Energy, Nevada Nuclear Waste Storage Investigations. Tis rort w*. Pp~jd asap i oun ofl3wk 4q'..nmtr byv n acwy f the Vasde S's WC" aiwni. V4ahlwi ti tiiNd Sljae 4. rnagnccl Oiu JaixfaYn htvf. fla ay o th'i v nagploytws. inut. a atrafty. %pvg w ripik. .g assmons any lepal iability oir vestainslaligy Mewtha aaar. .WY. V0PICUMNILaaa aa.1AaNIOCUof JnY M~ofilalkI. pg'aatu1S. plaa~d. iM g'MMc aduital. o tP ccnt hat ats uaw wual n ahow prw.atly oiwned i th. Itclemawe hti t any s.stW aoam- nmer.aI pruajuat. prisu~.. air vkv y r aine. radakmik. nnua..iax . o uherwiu.. Sas nut nC6Waxusayvitstltic a nly its nurwinen. raxumaienajatiu. a favtiny y tit U~nited Sics (aiwrann oir any .Arecnayglvocuf. The views anad pnions of avihuts eresased hundj ala nt nov- amiudy a r ilea h, attho;i atedtaStalts (.avaanlr air any .apty heuI. UNITED STATES DEPARTMENT OF ENERGY ) CONTRACT W7405-FENG. I LA-8845-MS UC 70 Issued: June 1981 Geology and Petrology of the Basalts of Crater Flat: Applications to Volcanic Risk Assessment for the Nevada Nuclear Waste Storage Investigations D. Vaniman B. Crowe I- I ,I - . GEOLOGY AND PETROLOGY OF THE BASALTS OF CRATER FLAT: APPLICATIONS TO VOLCANIC RISK ASSESSMENT FOR THE NEVADA NUCLEAR WASTE STORAGE INVESTIGATIONS by D. Vaniman and B. Crowe ABSTRACT Volcanic hazard studies of the south-central Great Basin, Nevada, are being conducted for the Nevada Nuclear Waste Storage Investigations. This report presents the results of field and petrologic studies of the basalts of Crater Flat, a sequence of Pliocene to Quaternary-age volcanic centers located near the southwestern part of the Nevada Test Site. Crater Flat is one of several basaltic fields constituting a north-northeast-trending volcanic belt of Late Cenozoic age extending from southern Death Valley, California, through the Nevada Test Site region to central Nevada. The basalts of Crater Flat are divided into three distinct volcanic cycles (3.7, 1.1, and 0.3 Myr) based upon geologic mapping, potassium-argon (K-Ar) dating, and magnetic polarity determina- tions. The cycles are characterized by eruption of basalt-magma of hawaiite composition that formed cinder cone clusters and associated lava flows. Total volume of erupted magma for respective cycles is about 0.5 to 4.0 x 10 1 km'; volumes of indi- vidual cinder cone and lava flow centers are about 0.3 to 1.5 km3. The basalts of Crater Flat are sparsely to moderately porphyritic; the major phenocryst phase is olivine, with lesser amounts of plagioclase, clinopyroxene, and rare amphibole. Basalts of the 3.7-Myr cycle contain glomeroporphyritic clots of bytownite and augite typical of hawaiite basalts in the southwestern United States. Major and trace- element differences between cycles, as well as the variations within cycles (in particular the 11-Myr cycle), cannot be explained simply by crystal- liquid fractionation. However, the consistent recurrence of evolved hawailte magmas in all three cycles points to- crystal fractionation from more primitive magmas at depth. A possible major i transition in mantle source regions through time may be indicated by a transition from normal to Rb- depleted, Sr-enriched hawaiites in the younger basaltic cycles. The recurrence of small volumes of hawaiite magma at Crater Flat supports assump- tions required for probability modeling of future volcanic activity and provides a basis for esti- mating the effects of volcanic disruption of a repository site in the southwestern Nevada Test Site region. Preliminary data suggest that succes- sive basalt cycles at Crater Flat may be of de- creasing volume but recurring more frequently. I. INTRO DUCTION The Nevada Nuclear Waste Storage Investigations (NNWSI) are evaluating the suitability of the Nevada Test Site (NTS) for location of a high-level radioactive waste repository. Current geologic exploration studies within the NTS are focused on Yucca Mountain (Dixon et al. 1980), a large fault block composed of multiple sequences of ash-flow tuff erupted from the Timber Mountain-Oasis Valley cauldron complex (Byers et al. 1976). Yucca Mountain is located within the south-central Great Basin, a physio- ) graphic subprovince of the larger Basin and Range Province, which includes much of the western United States. The Great Basin is a tectonically active re- gion. Its geologic history is characterized by extensional block faulting that produced linear mountain ranges separated by broad alluvial basins (Nolan 1943; Stewart 1978; Christiansen and McKee 1978). This faulting was closely associated in time and space with silicic volcanic activity at major cauldron complexes. Silicic volcanic rocks as old as 40 to 45 Myr are present in the central Great Basin. Younger volcanic rocks occur within broadly arcuate belts that are successively younger to the south and toward the margins of the Great Basin (Armstrong et al. 1969; Scott et al. 1971; Noble 1972; Stewart and Carlson 1978). Silicic rocks of late Miocene age are most abundant within an east-west-trending belt of the south-central Great Basin. This belt extends from southeastern Nevada through the NTS region and may bend to the northwest along the Walker Lane structural trend (Stewart and Carlson 1978). Since about 14 Myr ago, two major changes in the patterns of tectonic and volcanic activ- ity have occurred. First, there has been a progressive concentration of tec- tonic activity toward the margins of the Great Basin (Scholtz et al. 1971; 2 Christiansen et al. 1978). Second, silicic volcanic activity has been re- placed by basaltic volcanism including minor amounts of bimodal basalt- rhyolite volcanism (Christiansen and Lipman 1972; Christiansen and McKee 1978). This basaltic activity occurs within distinct belts along the eastern and western margins of the Great Basin (Stewart and Carlson 1978; Best and Hamblin 1978) and within a less prominent northeast-trending belt in the south- central Great Basin that extends through the NTS region (Fig. 1; Crowe and Carr 1980). Volcanic hazard studies, being conducted as a part of the NNWSI, are attempting to assess the risk of disruption of a waste repository within the NTS by future volcanic activity. Crowe and Sargent (1979) compared the geol- ogy and geochemistry of the Silent Canyon and Black Mountain peralkaline vol- canic centers, the latter representing the youngest major silicic volcanism within the NTS region. They concluded that the Black Mountain cycle repre- sents a renewed phase of silicic volcanism following the Timber Mountain- Silent Canyon volcanic cycle. This suggests that there is a small but finite possibility of recurrence of silicic volcanism within the NTS area. Crowe and Carr (1980) provided a preliminary assessment of the risk of basaltic volcan- ism within the southern Great Basin. They briefly described the Late Cenozoic volcanic geology of the southwestern NTS region, calculated the probability of disruption, and examined the disruption effects due to intrusion of a reposi- tory by basaltic magma. In this report, a continuation of previous work, we describe the detailed geology, geochronology, and petrology of the basalts of Crater Flat. This basaltic field is located within and adjacent to Crater Flat, an alluvial basin west and southwest of Yucca Mountain (Fig. 1). The basalts of Crater Flat record three small volume magma pulses that are spa- tially and temporally distinct (3.7, 1.1, and 0.3 Myr). Each pulse erupted basalt that may be classified as hawaiite following the definition by Best and Brimhall (1974). II. GEOLOGY AND PETROGRAPHY OF THE BASALTS OF CRATER FLAT Crater Flat contains over 15 small basaltic volcanic centers that consist of cinder cones and associated lava flows. The distribution and tectonic set- ting of the volcanic rocks has been described by Crowe and CUrr (1980). The rocks are divided into three distinct cycles or magma pulses based on geologic I I - - - - - - ) {Min eral N~ye * % \ 8 '- - -'- } - 3§ A;Lan oE.1,,*'*. og a u~~~~~~ 1~~380 4P C~* Inyo \~~N.,S~~~~l ~~Clark- a~~~ ~**;. I ~~~~ Mon *:s:. 4 1X I r. 01aO 0 00 l Kilometers 1180 1170 Ilse 115w 1140 Fig. 1. Distribution of Late Cenozoic basaltic volcanism in the south-central Great Basin. Modified from Stewart and Carlson 1978, and unpublished work by W. J. Carr. Gravity symmetry axis is the line of bilateral symmetry of the observed Bouguer gravity field of the Great Basin (after Eaton et al. 1978). LC, Lunar Crater volcanic field; RR, Basaltic rocks of the Reveille Range; QC, Basaltic rocks of the Quinn Canyon Range; BR, Basalt of Basalt Ridge; SC, Basaltic rocks of the Silent Canyon cauldron; SB, Basaltic rocks of the Sleeping Butte cauldron; BB, Basalt of Buckboard Mesa; PR, Basaltic rocks of Paiute Ridge; NC, Basaltic rocks of Nye Canyon; CF, Basaltic rocks of Crater Flat; 114, Basalt of Dome Mountain; SM, Basalt of Skull Mountain and Kiwi Mesa; GM, Basaltic rocks of the Greenwater Mountains; DV, Basaltic rocks of southern Death Valley; WL, Walker Lane; LV, Las Vegas shear zone; DV-FC, Death Valley- Furnace Creek fault. 4 N - field relations, potassium-argon ages (Table I), and magnetic polarity deter- minations (Fig. 2). * 3.7-Myr cycle (Tb, Tbp) Rocks of the older cycle-consist of deeply dissected cones and flows with locally exposed feeder dikes. ' They crop out in the central and southeastern part of Crater Flat (Fig.
Load more

Recommended publications
  • Schedule of Proposed Action (SOPA)
    Schedule of Proposed Action (SOPA) 01/01/2008 to 03/31/2008 Grand Mesa, Uncompahgre and Gunnison National Forests This report contains the best available information at the time of publication. Questions may be directed to the Project Contact. Expected Project Name Project Purpose Planning Status Decision Implementation Project Contact Projects Occurring Nationwide Aerial Application of Fire - Fuels management Completed Actual: 10/11/2007 10/2007 Christopher Wehrli Retardant 202-205-1332 EA [email protected] Description: The Forest Service proposes to continue the aerial application of fire retardant to fight fires on National Forest System lands. An environmental analysis will be conducted to prepare an Environmental Assessment on the proposed action. Web Link: http://www.fs.fed.us/fire/retardant/index.html Location: UNIT - All Districts-level Units. STATE - All States. COUNTY - All Counties. Nation Wide. National Forest System Land - Regulations, Directives, In Progress: Expected:02/2008 02/2008 Gina Owens Management Planning - Orders DEIS NOA in Federal Register 202-205-1187 Proposed Rule 08/31/2007 [email protected] EIS Est. FEIS NOA in Federal Register 01/2008 Description: The Agency proposes to publish a rule at 36 CFR part 219 to finish rulemaking on the land management planning rule issued on January 5, 2005 (2005 rule). The 2005 rule guides development, revision, and amendment of land management plans. Web Link: http://www.fs.fed.us/emc/nfma/2007_planning_rule.html Location: UNIT - All Districts-level Units. STATE - All
    [Show full text]
  • Frontier in Transition : a History of Southwestern Colorado
    BLM LIBRARY 88014165 FRONTIER IN TRANSITION PAUL M. ,6F(pURKE A ffifflSTCDISW ©IF c 3®aJTT[H]M[ES iriSISI (C©L©IBAID)® TODSLEMJ (Q)LP (OTLLCM^ffi)® CULTURAL RESOURCES SERIES DUMBER TEN Bureau of Land Management Library g. 50, Denver Federal Center Denver, CO 8G225 FRONTIER IN TRANSITION A HISTORY OF SOUTHWESTERN COLORADO by Paul M. O'Rourke BUREAU OF LAND MANAGEMENT LIBRARY Denver, Colorado 88614165 Colorado State Office Bureau of Land Management U °fLandMana8ement 19eo LX B'dg. 50, Denver Feriorai r„ . 6nter Denver, CO 80225 COPIES OF THIS REPORT ARE AVAILABLE FROM: BUREAU OF LAND MANAGEMENT COLORADO STATE OFFICE RM. 700, COLORADO STATE BANK BUILDING 1600 BROADWAY DENVER, COLORADO 80202 FOREWORD This study represents the tenth volume in a series of cultural resource studies. It was prepared as part of the Bureau of Land Management's Cultural Resource Manage- ment Program and is the second complete history of a BLM district in Colorado. A major objective of the Bureau of Land Management, Department of the Interior, is the identification, evaluation and protection of the nation's historic heritage and values, particularly those under the management of the Bureau. The history of Southwestern Colorado is designed to provide a baseline narrative for Cultural Resource Management. Paul M. O'Rourke has written a new history of the southwest corner of Colorado and in doing so, has provided a timely and original view of Colorado's heritage and history. This study will become part of the over-all history of Colorado as prepared by the Bureau and as other volumes dealing with Colorado history are written, they too will be made available to the general public.
    [Show full text]
  • Schedule of Proposed Action (SOPA)
    Schedule of Proposed Action (SOPA) 07/01/2019 to 09/30/2019 Grand Mesa, Uncompahgre and Gunnison National Forests This report contains the best available information at the time of publication. Questions may be directed to the Project Contact. Expected Project Name Project Purpose Planning Status Decision Implementation Project Contact Projects Occurring in more than one Region (excluding Nationwide) Western Area Power - Special use management On Hold N/A N/A David Loomis Administration Right-of-Way 303-275-5008 Maintenance and [email protected] Reauthorization Project Description: Update vegetation management activities along 278 miles of transmission lines located on NFS lands in Colorado, EIS Nebraska, and Utah. These activities are intended to protect the transmission lines by managing for stable, low growth vegetation. Web Link: http://www.fs.usda.gov/project/?project=30630 Location: UNIT - Ashley National Forest All Units, Grand Valley Ranger District, Norwood Ranger District, Yampa Ranger District, Hahns Peak/Bears Ears Ranger District, Pine Ridge Ranger District, Sulphur Ranger District, East Zone/Dillon Ranger District, Paonia Ranger District, Boulder Ranger District, West Zone/Sopris Ranger District, Canyon Lakes Ranger District, Salida Ranger District, Gunnison Ranger District, Mancos/Dolores Ranger District. STATE - Colorado, Nebraska, Utah. COUNTY - Chaffee, Delta, Dolores, Eagle, Grand, Gunnison, Jackson, Lake, La Plata, Larimer, Mesa, Montrose, Routt, Saguache, San Juan, Dawes, Daggett, Uintah. LEGAL - Not Applicable. Linear
    [Show full text]
  • Grand Mesa, Uncompahgre, and Gunnison National Forests DRAFT Wilderness Evaluation Report August 2018
    United States Department of Agriculture Forest Service Grand Mesa, Uncompahgre, and Gunnison National Forests DRAFT Wilderness Evaluation Report August 2018 Designated in the original Wilderness Act of 1964, the Maroon Bells-Snowmass Wilderness covers more than 183,000 acres spanning the Gunnison and White River National Forests. In accordance with Federal civil rights law and U.S. Department of Agriculture (USDA) civil rights regulations and policies, the USDA, its Agencies, offices, and employees, and institutions participating in or administering USDA programs are prohibited from discriminating based on race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, family/parental status, income derived from a public assistance program, political beliefs, or reprisal or retaliation for prior civil rights activity, in any program or activity conducted or funded by USDA (not all bases apply to all programs). Remedies and complaint filing deadlines vary by program or incident. Persons with disabilities who require alternative means of communication for program information (e.g., Braille, large print, audiotape, American Sign Language, etc.) should contact the responsible Agency or USDA’s TARGET Center at (202) 720-2600 (voice and TTY) or contact USDA through the Federal Relay Service at (800) 877-8339. Additionally, program information may be made available in languages other than English. To file a program discrimination complaint, complete the USDA Program Discrimination Complaint Form, AD-3027, found online at http://www.ascr.usda.gov/complaint_filing_cust.html and at any USDA office or write a letter addressed to USDA and provide in the letter all of the information requested in the form.
    [Show full text]
  • Summits on the Air – ARM for USA - Colorado (WØC)
    Summits on the Air – ARM for USA - Colorado (WØC) Summits on the Air USA - Colorado (WØC) Association Reference Manual Document Reference S46.1 Issue number 3.2 Date of issue 15-June-2021 Participation start date 01-May-2010 Authorised Date: 15-June-2021 obo SOTA Management Team Association Manager Matt Schnizer KØMOS Summits-on-the-Air an original concept by G3WGV and developed with G3CWI Notice “Summits on the Air” SOTA and the SOTA logo are trademarks of the Programme. This document is copyright of the Programme. All other trademarks and copyrights referenced herein are acknowledged. Page 1 of 11 Document S46.1 V3.2 Summits on the Air – ARM for USA - Colorado (WØC) Change Control Date Version Details 01-May-10 1.0 First formal issue of this document 01-Aug-11 2.0 Updated Version including all qualified CO Peaks, North Dakota, and South Dakota Peaks 01-Dec-11 2.1 Corrections to document for consistency between sections. 31-Mar-14 2.2 Convert WØ to WØC for Colorado only Association. Remove South Dakota and North Dakota Regions. Minor grammatical changes. Clarification of SOTA Rule 3.7.3 “Final Access”. Matt Schnizer K0MOS becomes the new W0C Association Manager. 04/30/16 2.3 Updated Disclaimer Updated 2.0 Program Derivation: Changed prominence from 500 ft to 150m (492 ft) Updated 3.0 General information: Added valid FCC license Corrected conversion factor (ft to m) and recalculated all summits 1-Apr-2017 3.0 Acquired new Summit List from ListsofJohn.com: 64 new summits (37 for P500 ft to P150 m change and 27 new) and 3 deletes due to prom corrections.
    [Show full text]
  • Predicting Channel Stability in Colorado Mountain Streams
    AN ABSTRACT OF THE DISSERTATION OF SteDhanie L. Moret for the degree of Doctor of PhilosoDhy in Environmental Sciences presented on March 16, 2001. Title: Predictinc Channel Stability in Colorado Mountain Streams UsinQ HydrobioQeomorDhic and Land Use Data: A Cost-Sensitive Machine Learnincj Aprroach to ModelinQ RaDid Assessment Protocols. Abstract aPPro Redacted for Privacy Peter cMlincieman Natural resource data are typically non-linear and complex, yet modeling methods oftenutilizestatisticalanalysis techniques, such as regression, that are insufficient for use on such data. This research proposes an innovative modeling method based on pattern recognition techniques borrowed from the field of machine learning. These techniques make no data distribution assumptions, can fit non-linear data, can be effective on a small data set, and can be weighted to include relative costs of different predictive errors. Rapid Assessment Protocols (RAPs) are commonly used to collect, analyze, and interpret stream data to assist diverse management decisions. A modeling method was developed to predict the outcome of a RAP in an effort to improve accurate prediction, weighted for cost-effectiveness and safety, while prioritizing investigations and improving monitoring.This method was developed using channel stability data collected from 58 high-elevation streams in the Upper Colorado River Basin. The purpose of the research was to understand the relationships of channel stability to several hydrobiogeomorphic features, easily derived from paper or electronic maps, in an effort to predict channel stability. Given that the RAP used was developed to evaluate channel stability, the research determined:1) relationships between channelstability and major land-use and hydrobiogeomorphic features, and 2) if a predictive model could be developed to aid in identifying unstable channel reaches while minimizing costs, for the purpose of land management.
    [Show full text]
  • Colorado Topographic Maps, Scale 1:24,000 This List Contains The
    Colorado Topographic Maps, scale 1:24,000 This list contains the quadrangle names and publication dates of all Colorado topographic maps published at the scale of 1:24,000 by the U.S. Geological Survey (USGS). One, non-circulating copy of each map is held in the Map Room Office. The Library does not own maps labeled "lacking." The maps are sorted alphabetically by sheet name. Colorado 1:24,000 Topos -- A Abarr 1974 printed 1977 Abarr SE 1968 printed 1971 1968 (without color) printed 1971 Abeyta 1971 printed 1974 1971 (without color) printed 1974 Adams Lake 1974 printed 1978 (dark), 1978 (light) 1974 (without color) printed 1978 1987 printed 1988 Adena 1963 printed 1965, 1975 1963 (without color) printed 1965 1984 printed 1984 1984 (without color) printed 1984 Adler Creek 1968 printed 1971 1968 (without color) printed 1971 Adobe Downs Ranch, New Mexico-Colorado 1963 printed 1965 1963 (without color) printed 1965 1979 printed 1980 (dark), 1980 (light) Adobe Springs 1969 printed 1972, 1992 1969 (without color) printed 1972 Agate 1970 printed 1973 (dark), 1973 (light) 1970 (without color) printed 1973 Agate Mountain 1983 printed 1983 1994 printed 1998 Aguilar 1971 printed 1974 1971 (without color) printed 1974 Akron 1973 printed 1976 1973 (without color) printed 1976 Akron SE 1973 printed 1976 Akron SW 1973 printed 1976 Alamosa East 1966 printed 1968, 1975 1966 (without color) printed 1968 Alamosa West 1966 printed 1969, 1971 1966 (without color) printed 1969 Aldrich Gulch 1957 printed 1958, 1964, 1975 (dark), 1975 (light) 1957 (without color)
    [Show full text]
  • If .ASSIFIED LEGAL NOTICE This Report Was Prepared As an Account of Government Sponsored Work
    UNCLASSIFIED [£640* GEOLOGY AND MINEMfiLOGY U. S. DEPARTMENT OF THE INTERIOR GEOLOGIC INVESTIGATIONS OF RADIOACTIVE DEPOSITS Semiannual Progress Report for June 1 to November 30, 1956 This report is preliminary and has not been edited or reviewed for conformity with U. S. Geological Survey standards and nomenclature. December 1956 Geological Survey Washington, D. C. Prepared by Geological Survey for the UNITED STATES ATOMIC ENERGY COMMISSION Technical Information Service Extension, Oak Ridge, Tennessee 40455 [If .ASSIFIED LEGAL NOTICE This report was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission: A. Makes any warranty or representation, express or implied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the'use of any information, apparatus, method-, or process disclosed in this report may not infringe privately owned rights; or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on behalf of the Commission" includes any em­ ployee or contractor of the Commission to the extent that such employee or contractor prepares, handles or distributes, or provides access to, any information pursuant to his employment or contract with the Commission. I This report has been reproduced directly from the best available copy. Printed in USA, Price $1.50. Available from the Office of Technical Services, Department of Commerce, Washington 25, D. C. AEC, Oak Ridge.
    [Show full text]
  • Board Resolution Adopting the Official Street Name List
    DocuSign Envelope ID: 14D0EADE-B4CE-49C9-A8E7-F7AA6AB2A2EA RESOLUTION OF THE BOARD OF COUNTY COMMISSIONERS OF SAN MIGUEL COUNTY, COLORADO, RESCINDING RESOLUTION 2011-22 AND IMPLEMENTING THE UPDATED VERSION OF THE SAN MIGUEL COUNTY OFFICIAL STREET NAME LIST 030 Resolution #2020 - _________ WHEREAS, on July 28, 2005 the Board of County Commissioners of San Miguel County, Colorado, (“BOCC”), enacted Resolution 2005-23 providing for the “Adoption of an Amendment to the San Miguel County Land Use Code Changing Language in Section 5-502 HH. Street Names and Sign Locations and Adding a New Appendix B: Street Naming and Addressing Standards;” and WHEREAS, pursuant to BOCC Resolution 2005-23, and in accordance with the County Land Use Code Appendix B: Street Naming and Addressing Standards, the San Miguel County Addressing Official has developed the “San Miguel County Official Street Name List,” a copy of which is attached hereto and incorporated herein by this reference as Exhibit “A;” and WHEREAS, at a duly noticed public meeting held on November 4, 2020, at Telluride, Colorado, the BOCC considered the adoption of the “San Miguel County Official Street Name List,” a copy of which is attached hereto as Exhibit “A” and does hereby find and determine from the testimony and evidence received at that public meeting that Exhibit “A” appears to be in compliance with the County Land Use Code Appendix B: Street Naming and Addressing Standards, and that the public health, safety, and welfare will be served by the adoption of Exhibit “A” as the “San Miguel County Official Street Name List.” NOW, THEREFORE, BE IT RESOLVED, by the Board of County Commissioners of San Miguel County, Colorado, as follows: 1.
    [Show full text]
  • Schedule of Proposed Action (SOPA)
    Schedule of Proposed Action (SOPA) 10/01/2018 to 12/31/2018 Grand Mesa, Uncompahgre and Gunnison National Forests This report contains the best available information at the time of publication. Questions may be directed to the Project Contact. Expected Project Name Project Purpose Planning Status Decision Implementation Project Contact Projects Occurring in more than one Region (excluding Nationwide) Western Area Power - Special use management On Hold N/A N/A David Loomis Administration Right-of-Way 303-275-5008 Maintenance and [email protected] Reauthorization Project Description: Update vegetation management activities along 278 miles of transmission lines located on NFS lands in Colorado, EIS Nebraska, and Utah. These activities are intended to protect the transmission lines by managing for stable, low growth vegetation. Web Link: http://www.fs.usda.gov/project/?project=30630 Location: UNIT - Ashley National Forest All Units, Grand Valley Ranger District, Norwood Ranger District, Yampa Ranger District, Hahns Peak/Bears Ears Ranger District, Pine Ridge Ranger District, Sulphur Ranger District, East Zone/Dillon Ranger District, Paonia Ranger District, Boulder Ranger District, West Zone/Sopris Ranger District, Canyon Lakes Ranger District, Salida Ranger District, Gunnison Ranger District, Mancos/Dolores Ranger District. STATE - Colorado, Nebraska, Utah. COUNTY - Chaffee, Delta, Dolores, Eagle, Grand, Gunnison, Jackson, Lake, La Plata, Larimer, Mesa, Montrose, Routt, Saguache, San Juan, Dawes, Daggett, Uintah. LEGAL - Not Applicable. Linear
    [Show full text]
  • Eagle's View of San Juan Mountains
    Eagle’s View of San Juan Mountains Aerial Photographs with Mountain Descriptions of the most attractive places of Colorado’s San Juan Mountains Wojtek Rychlik Ⓒ 2014 Wojtek Rychlik, Pikes Peak Photo Published by Mother's House Publishing 6180 Lehman, Suite 104 Colorado Springs CO 80918 719-266-0437 / 800-266-0999 [email protected] www.mothershousepublishing.com ISBN 978-1-61888-085-7 All rights reserved. No part of this book may be reproduced without permission in writing from the copyright owner. Printed by Mother’s House Publishing, Colorado Springs, CO, U.S.A. Wojtek Rychlik www.PikesPeakPhoto.com Title page photo: Lizard Head and Sunshine Mountain southwest of Telluride. Front cover photo: Mount Sneffels and Yankee Boy Basin viewed from west. Acknowledgement 1. Aerial photography was made possible thanks to the courtesy of Jack Wojdyla, owner and pilot of Cessna 182S airplane. Table of Contents 1. Introduction 2 2. Section NE: The Northeast, La Garita Mountains and Mountains East of Hwy 149 5 San Luis Peak 13 3. Section N: North San Juan Mountains; Northeast of Silverton & West of Lake City 21 Uncompahgre & Wetterhorn Peaks 24 Redcloud & Sunshine Peaks 35 Handies Peak 41 4. Section NW: The Northwest, Mount Sneffels and Lizard Head Wildernesses 59 Mount Sneffels 69 Wilson & El Diente Peaks, Mount Wilson 75 5. Section SW: The Southwest, Mountains West of Animas River and South of Ophir 93 6. Section S: South San Juan Mountains, between Animas and Piedra Rivers 108 Mount Eolus & North Eolus 126 Windom, Sunlight Peaks & Sunlight Spire 137 7. Section SE: The Southeast, Mountains East of Trout Creek and South of Rio Grande 165 9.
    [Show full text]
  • West Region Wildfire Council Meeting Minutes 5/11/17
    West Region Wildfire Council Meeting Minutes 5/11/17 Last Name First Name Affiliation Austin Tom Log Hill Fire Bennett John Telluride Fire Copeland Kristin Colorado Parks and Wildlife Dinsmore Jennifer San Miguel County Falk Lilia WRWC Gomez Jamie WRWC Haefner Lee CSFS Lewis Brandon BLM Lingenfelter Ed Blue Mesa HOA Megel Mike BLM Menz Mary Ouray Plaindealer Mitchell Henry San Miguel County Odom Luke DFPC Oxford Ross NPS Rogers John Log Hill Fire Scott Mandy CSFS Shelby Austin CSFS Swainson Roy Blue Mesa HOA Tarantino Mike WRWC Tisdel Ben Ouray County Wright Jeff Delta County Presentation of the Rocky Mountain Coordinating Group’s PRIME Award On behalf of the Rocky Mountain Area Coordination Center, Brandon Lewis presented the Prevention Information Mitigation Education (PRIME) Award to the West Region Wildfire Council. Two PRIME Awards were awarded in 2017, one award in Fire Prevention and one award in Fire Mitigation. The 2017 PRIME Mitigation Award was presented to the West Region Wildfire Council’s Staff and Steering Committee for “outstanding contributions with significant program impact in wildfire mitigation, reducing the wildfire risk to communities within the Rocky Mountain Area”. Introductions Lilia Falk facilitated the meeting and initiated a round of introductions. She then introduced Russell Mann, the Fire Meteorologist for the Rocky Mountain Area Coordination Center in Lakewood, Colorado. Russell called in to present a “2017 Fire Weather Forecast” from the Predictive Services Program. Presentation: “2017 Fire Weather Forecast” presented by Russell Mann, Fire Meteorologist for the Rocky Mountain Area Coordination Center. Before Russell Mann started discussing this summer’s fire weather forecast he discussed the historic fire conditions in the West Region.
    [Show full text]