Draft EIS_072312.pdf - Middle Fork American River Project ...

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20120723-4002 FERC PDF (Unofficial) 07/23/2012 most frequent use for visitors to the Middle Fork interbay (using the reach downstream of the dam). The estimated visitor use at Long Canyon is 2,000 recreation visitor-days per year and the visitor use at the interbay is too low to estimate. Ralston afterbay is located at the lowest elevation of the project. The area receives recreation use associated with the afterbay as well as the river reach downstream of the dam. Camping is prohibited at the afterbay so only day use activities such as picnicking, reservoir boating, angling, and river access occur in this area. Limitations of the boat ramp preclude launching motorized watercraft so only non-motorized boating use occurs on this 71-acre reservoir. The estimated recreation use at the Ralston afterbay picnic area is about 600 recreation visitor-days per year. PCWA estimates visitor use associated with the downstream access is 1,200 recreation visitor-days; however this estimate does not include the use attributed to commercial whitewater boating, which accounts for most of the use at the Indian Bar rafter access. The project does not include any non-motorized trails for recreational use, but hiking occurs throughout the area on a variety of NFS trails and other non-system trails. Trails in the vicinity of the project are shown on figures 3.3.5-1 through 3.3.5-4. Most of the non-motorized trails within the Tahoe and Eldorado National Forests are considered multi-purpose and are used for hiking, mountain biking, and equestrian use; OHV use is restricted to designated routes. Recreation in River Reaches Whitewater Recreation Occasional use (e.g., one or two runs per year) by advanced or expert boaters was documented on the bypassed reaches. Only one reach, the Rubicon River between Ellicott Bridge and Ralston afterbay, is boated with any regularity. Use patterns appear to be limited by various factors including remote access; steep gradient; narrow, boulderstrewn stream channels; lack of flow information; and limited road access in the spring because of snow. The bypassed reaches are not boated commercially. Table 3.3.5-2 summarizes the whitewater boating opportunities on the bypassed reaches. The peaking reach extends from Oxbow powerhouse downstream to the highwater mark of Folsom reservoir, and it has two river segments that provide whitewater boating opportunities: (1) the Middle Fork American River from Oxbow powerhouse to the confluence of the North Fork American River; and (2) the North Fork American River from the confluence of the Middle Fork American River to Oregon Bar located on Folsom reservoir (table 3.3.5-3). 202
20120723-4002 FERC PDF (Unofficial) 07/23/2012 Table 3.3.5-2. Whitewater boating opportunities on the bypassed reaches (Source: PCWA, 2011a). Reach Class a Rubicon River (RM 25 to Ellicott Bridge) Ellicott Bridge to Ralston afterbay Confluence of North and South Fork Long Canyon Creeks to confluence with Rubicon River French Meadows dam to Middle Fork interbay Middle Fork interbay dam to Ralston afterbay 203 Boatable Range (cfs) Optimum flow (cfs) V 400 to1,500 500–1,000 V 400 to3,000 500–1,500 IV+ to V V 215 to450 b 200 to 600 300–500 300–350 b IV to V (400–425) c to 600 b 450 c (450–465) b to 600 b 550–550 b a The American Whitewater Scale of River Difficulty: Class I, Easy: Fast moving water with riffles and small waves; Class II, Novice: Straightforward rapids with wide, clear channels which are evident without scouting; Class III, Intermediate: Rapids with moderate, irregular waves which may be difficult to avoid and which can swamp an open canoe; Class IV, Advanced: Intense, powerful but predictable rapids requiring precise boat handling in turbulent water; Class V, Expert: Extremely long, obstructed or very violent rapids which expose a boater to added risk; Class VI, Extreme and Exploratory: These runs have almost never been attempted and often exemplify the extremes of difficulty, unpredictability, and danger. b As measured at the take-out. c As measured at the put-in.
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41 Table 3.3.1-1. Average number of
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43 Site/Release Location Gravel Ini
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45 a Q 1 - TSR, Table G-1 (PCWA, 20
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69 Table 3.3.2-3. Hydrology for sel
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71 Exceedances and Summary Statisti
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91 Figure 3.3.2-6. Fish passage bar
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105 Location American River below M
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135 Species Name Status a Butte Cou
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145 Table 3.3.3-5. Special-status w
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147 Species Name Status Habitat Occ
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149 Species Name Status Habitat Occ
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Page 225 and 226: 195 Figure 3.3.5-1. French Meadows
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253 Table 3.3.6-1. Archaeological a
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255 Resource Number Type a Descript
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275 Table 4-2. Summary of annual co
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279 Enhancement/Mitigation Measures
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303 c Base 2010 costs were provided
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307 Resource No-Action Alternative
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319 Table 5-2. Staff-recommended mi
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321 Location Middle Fork American R
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