2014-01-29_HYDROLOGY - P2009025 (8)

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Baseline Hydrologic Monitoring Plan — Hansen Project 12 The stream gradient of Squaw Creek is about 400 ft/mi in the upper drainage, and 175 ft/mi near the confluence with Salt Creek. 2.2.2.3 Salt Creek Salt Creek (Figure 4) is a small, intermittent stream that flows through a wide, flat- bottomed channel above its confluence with Squaw Creek and later Cottonwood Creek. The flow in Salt Creek is dominated by snowmelt, showing a seasonal trend of higher flow during the spring. Although Salt Creek is mapped as intermitted by the USGS, it contained water during every sampling event from fall 2008 through fall 2011. Salt Creek was dry during the annual sampling event in fall 2012 was flowing in fall 2013. The maximum flow rate for Salt Creek was 0.09 cfs measured in November, 2009. Flow rates for Salt Creek are mostly below 0.02 cfs. Figure 4. Photograph of Salt Creek Near Station S W04 -SA 2.2.2.4 North Tallahassee Creek North Tallahassee Creek is a very small perennial stream that flows down a moderately graded canyon into the Project area and exits the Project area through a riparian plain. North Tallahassee Creek is fed by a system of springs and intermittent streams off of the east side of Waugh Mountain. Flow rates for North Tallahassee Creek vary based on the sampling site. Stream flow measurements from 2008 to 2013 are provided in Appendix I. The maximum flow rate for North Tallahassee Creek was 0.87 cfs measured at station SW 17 -NT in June, 2010. The flow rates for North Tallahassee Creek decrease further downstream. The average stream gradient within the Project boundary is 120 ft/mi. 2.2.2.5 Middle Tallahassee Creek Middle Tallahassee Creek is a very small ephemeral stream that flows down a steep broad open area into the Project area where the gradient decreases. Outside of the Project area the stream flows to the confluence with North Tallahassee Creek and later South Tallahassee Creek. The stream is fed by 4153A.140129 Whetstone Associates