Recreation, Aesthetics, and Land Use Report Cache La Poudre Basin Study Extension
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Recreation, Aesthetics, and Land Use Report Cache la Poudre Basin Study Extension Prepared For Colorado Water Resources and Power Development Authority o envirosphere company March 1990 CACHE LA POUDRE BASIN STUDY EXTENSION RECREATION, AESTHETICS, AND LAND USE TASK REPORT Colorado Water Resources & Power Development Authority Logan Tower Bldg., Suite 620 1580 Logan Street Denver, CO 80203 Prepared by Envirosphere Company 10900 NE 8th Street Bellevue, WA 98004-4405 and Outdoor Recreation Resources Associates 1720 Kirkwood Drive, No. N21 Fort Collins, CO 80525 March 1990 2176K 5.0 RECREATION, AESTHETICS, AND LAND USE STUDIES TABLE OF QQNTENTS Page 5.1 INTRODUCTION ...................................................... 5-1 5.1.1 Project Description ........................................ 5-1 5.1.2 study Objectives ........................................... 5-3 5.1.3 study Area ................................................. 5-4 5. 1.4 General Methods............................................ 5-4 5.1.5 Report Organization ........................................ 5-5 5.2 RECREATION........................................................ 5-6 5.2.1 Overview ................................................... 5-7 5.2.1.1 Study Objecti ves .................................. 5-7 5.2.1.2 Study Area ........................................ 5-11 5.2.1.3 Methods ........................................... 5-12 5.2.2 Existing Conditions ........................................ 5-21 5.2.2.1 General Setting ................................... 5-22 5.2.2.2 Secondary Study Area .............................. 5-23 5.2.2.3 Primary Study Area ................................ 5-33 5.2.3 Project Effects ............................................ 5-46 5.2.3. 1 Di rect Effects.................................... 5-47 5.2.3.2 Indirect Effects .................................. 5-60 5.2.3.3 Comparison of Effects ............................. 5-80 5.2.4 Mitigation ................................................. 5-82 5.2.4.1 Grey Mountain Alternative ......................... 5-86 5.2.4.2 Poudre Alternative ................................ 5-95 5.2.4.3 Alternative Comparison and Evaluation of Mi ti gated Effects............................... 5-97 5.2.5 Recommended Future Studies ................................ 5-103 5.3 AESTHETICS........................................................ 5-108 5.3.1 Overview ................................................... 5-108 5.3.1.1 Study Objectives .................................. 5-108 5.3. 1 .2 Study Area........................................ 5-108 5.3.1.3 Methods ........................................... 5-109 2176K i i TABLE OF CONTENTS (Continued) Page 5.3.2 Existing Conditions ........................................ 5-111 5.3.2.1 Visual Character .................................. 5-112 5.3.2.2 Viewer Characteristics ............................ 5-120 5.3.3 Project Effects ............................................ 5-124 5.3.3.1 Landscape Change and Visibility ................... 5-124 5.3.3.2 Management Compatibility .......................... 5-134 5 . 3 . 4 Mit i gat i on . .. 5-137 5.3.5 Recommended Future Studies ................................. 5-140 5.4 LAND USE .......................................................... 5-146 5.4.1 Overview ................................................... 5-146 5.4.1.1 Study Objectives .................................. 5-146 5.4.1.2 Study Area ........................................ 5-146 5.4.1.3 Methods ........................................... 5-147 5.4.2 Existing Conditions ........................................ 5-148 5.4.2.1 Land Ownership .................................... 5-148 5.4.2.2 Key Land Resources ................................ 5-152 5.4.2.3 Resource Productivity and Constraints ............. 5-159 5.4.2.4 Development Trends and Potential .................. 5-163 5.4.3 Project Effects ............................................ 5-170 5.4.3.1 Direct Land Use Effects ........................... 5-170 5.4.3.2 Indirect and Induced Land Use Changes ............. 5-176 5.4.4 Mitigation ................................................. 5-179 5.4.5 Recommended Future Studies ................................. 5-180 5.5 SUMMARy........................................................... 5-182 5.5.1 Recreation ................................................. 5-182 5.5.2 Aesthetics ................................................. 5-185 5.5.3 Land Use ................................................... 5-189 5.6 REFERENCES ........................................................ 5-192 APPENDIX B SUPPORTING INFORMATION 2176K iii LIST OF TABLES Table Page 5.1 Key Recreation Issues ........................................ 5-8 5.2 National Forest Dispersed Recreation Settings ................ 5-25 5.3 Designated Wild Trout and Gold Medal River Mileage in Colorado .......................................... 5-29 5.4 Other Floatable Whitewater Rivers in Colorado ................ 5-31 5.5 Estimated 1987 Developed Recreation Use, Primary Study Area .. 5-35 5.6 Estimated 1987 Dispersed Recreation Use, Primary Study Area .. 5-39 5.7 Poudre River Flows, Mean Days Per Year in Specified Range ... 5-40 5.8 Commercial Whitewater Boating Use in Lower Poudre Canyon, 1985-1 987 . .. 5-43 5.9 Classes of Most Difficult Rapids in Primary Study Area by Flow Range................................................ 5-44 5.10 Recreation Settings Within Inundation Zone, Grey Mountain Alternative ......................................... 5-50 5.11 Direct Effects on Recreation Use, Grey Mountain Alternative .. 5-54 5.12 Recreation Settings Within Inundation Zone, Poudre A1 ternati ve .................................................. 5-56 5.13 Direct Effects on Recreation Use, Poudre Alternative ......... 5-59 5.14 Comparison of Direct Recreation Effects, Grey Mountain and Poudre Alternatives ............................. 5-60 5.15 Historical and Simulated With-Project Poudre River Mean Monthly Flows .............................. 5-68 5.16 Historical and Simulated With-Project Poudre River Mean Annual Days Within Specified Flow Ranges ... 5-69 5.17 Instream Effects on Whitewater Boating Due to Downstream Changes in Streamflow ............................. 5-79 5.18 Summary Comparison of Direct and Indirect Effects ............ 5-81 5.19 Total Estimated Recreation Mitigation Costs, Grey Mountain and Poudre Alternati ves ...................................... 5-98 5.20 Potential Net Recreation Effects, Grey Mountain Alternative .. 5-100 5.21 Potential Net Recreation Effects, Poudre Alternative ......... 5-102 5.22 Simulated Reservoir Surface Levels ........................... 5-130 21761{ iv LIST OF TABLES (Continued) Table Page 5.23 Land Ownership Within Primary Study Area ..................... 5-149 5.24 Urbanization of Rural Lands, 1960-1983 ....................... 5-164 5.25 Grey Mountain Project, Land Ownership Within Project Boundary ............................................. 5-172 2176K v LIST OF FIGURES Figure Page 5. 1 Project Location and Facilities ........................... 5-201 5.2 Recreation Study Areas .................................... 5-202 5.3 Pri mary Study Area ........................................ 5-203 5.4 Existing Recreation Resources, Secondary Study Area ....... 5-204 5.5 Colorado Gold Medal and Wild Trout Water .................. 5-205 5.6 Floatable Whitewater Rivers in Colorado ................... 5-206 5.7 EXisting Recreation Features, Primary Study Area .......... 5-207 5.8 Upstream View Northwest Toward Grey Mountain Damsite ...... 5-208 5.9 Downstream View Southeast Toward Poudre Damsite ........... 5-208 5.10 Downstream View at Informal Access Site Between Grey Mountain and Poudre Sites ................................. 5-209 5.11 Upstream View Toward North Fork/Mainstem Confluence, Near Fort Collins Filtration Plant ........................ 5-209 5.12 Downstream View of Mainstem 0.5 Mile Above Poudre Damsite .. 5-210 5.13 Downstream View of Greyrock Trailhead Bridge Across Mai nstem....................... ............... ............. 5-210 5.14 View of the North Fork <Middle Left) and Mainstem <Middle Right) Drainages from the Top of Greyrock Mountain ........ 5-211 5.15 Photo Locations for Figures 5.8-5.14 ...................... 5-212 5.16 Forest Service Management Areas ........................... 5-213 5.17 Land Ownership ............................................ 5-214 5.18 National Forest Land Management ........................... 5-215 5.19 Floodplains, Wetlands, and Important Farmlands ............ 5-216 2176K vi 5.0 RECREATION, AESTHETICS, AND LAND USE STUDIES 5.1 INTRODUCTION This report documents recreation, aesthetics, and land use studies for the proposed Cache 1a Poudre Water and Power Project conducted during late 1987 and 1988. The recreation, aesthetics, and land use scope of work was identified as Task No. 14 of the Cache 1a Poudre Basin Study Extension undertaken by the Colorado Water Resources and Power Development Authority (Authority) and the Northern Colorado Water Conservancy District (District). The 1987-88 studies update and expand upon the results of the previous Cache la Poudre Basin Study, which was completed in 1987. 5.1.1 Project Description The preferred configuration for Stage 1 of the proposed project consists of a water storage reservoir and conventional hydroelectric generation plant that would be located on the mainstem of the Cache la Poudre River, approximately 10 miles