None planned.
Data Source: FWS 2007 (pgs 113-117) and FWS Rearing 2011 (pgs 144-157) and FWS Spawning 2011 (pgs 107-109) and FWS 2013 (pgs 150-160)
Instream spawning and rearing habitat for Fall Run Chinook Salmon, Spring Run Chinook Salmon, and Steelhead in Clear Creek are based on data from four U.S. Fish and Wildlife Service (USFWS) instream flow evaluations. The data were collected between 2007 and 2013 for the Central Valley Project Improvement Act (CVPIA). These evaluations uncovered relationships between flow and suitable spawning and rearing habitat area for “upper” (Whiskeytown Dam to Clear Creek Road) and “lower” (Clear Creek Road to the Sacramento River) Clear Creek. The original data can be found on pages 113 - 117 of FWS 2007 (Upper Clear Creek spawning), pages 144 - 157 of FWS Rearing 2011 (Upper Clear Creek rearing, pages 107 - 109 of FWS Spawning 2011 (Lower Clear Creek spawning), and pages 150 - 160 of FWS 2013 (Lower Clear Creek rearing). Mark Gard from the California Department of Fish and Wildlife combined the habitat data from these four studies into a spreadsheet for the entire Clear Creek watershed. Mark Gard instructed us to use A3:G26, A30:G53, and A58:G81 of the ‘Clear’ tab within the spreadsheet. These cells represent the weighted usable area (WUA) in square feet for the lower alluvial (8.81 mi), canyon (7.33 mi), and upper alluvial (2.27 mi) segments. Fall Run are only present in the lower alluvial segment. The Fall Run spawning data are an estimate provided by Clear Creek watershed experts upon receiving feedback that the FWS estimates had been too low.
The instream spawning and rearing habitat data described above for Fall Run Chinook Salmon (FR), Spring Run Chinook Salmon (SR), and Steelhead (ST) is combined for use in the Decision Support Model (DSM) in the following format. Units are in square feet per 1000 feet.
flow_cfs | FR_spawn_wua | FR_fry_wua | FR_juv_wua | SR_spawn_wua | SR_fry_wua | SR_juv_wua | ST_spawn_wua | ST_fry_wua | ST_juv_wua | watershed |
---|---|---|---|---|---|---|---|---|---|---|
50 | 13000 | 11526.29 | 4835.135 | 34.26847 | 3138.600 | 1862.912 | 266.3449 | 2308.075 | 1862.912 | Clear Creek |
75 | 13000 | 11367.48 | 5341.167 | 65.47901 | 3094.353 | 2379.461 | 410.8645 | 2287.449 | 2379.461 | Clear Creek |
100 | 13000 | 11082.30 | 5753.491 | 98.36648 | 3115.875 | 2843.080 | 538.2142 | 2211.300 | 2843.080 | Clear Creek |
125 | 13000 | 10788.47 | 6089.671 | 128.31439 | 3178.732 | 3259.325 | 652.2620 | 2174.255 | 3259.325 | Clear Creek |
150 | 13000 | 10549.26 | 6381.845 | 156.80240 | 3192.209 | 3639.398 | 751.0534 | 2151.992 | 3639.398 | Clear Creek |
… with 18 more rows
The following plot shows the weighted usable spawning area (WUA) in square feet per thousand feet for Fall Run Chinook salmon, Spring Run Chinook Salmon, and Steelhead. These area per length rates are multiplied by the total spawning reach length mapped by the Science Integration Team (SIT) to estimate available habitat.
The following plot shows the rearing WUA in square feet per thousand feet for Fall Run Chinook Salmon, Spring Run Chinook Salmon, and Steelhead fry and juvenile. The juvenile rearing data are the same for Spring Run and Steelhead. These rates are multiplied by the total rearing reach length mapped by the SIT to estimate available habitat.
Data Source: Scaled from a Cottonwood Creek flow to floodplain area relationship generated with a USFWS / FEMA 1D HEC-RAS hydraulic model. See Cottonwood Creek modeling documentation for more details.
There was no watershed specific hydraulic modeling available for Clear Creek. A flow to inundated floodplain area relationship was generated for Clear Creek by scaling the flow to inundated floodplain area relationship for Cottonwood Creek. This scaling used the ratio of mean flow from December to June between the modeled and unmodeled watershed. Flows and corresponding inundated floodplain areas per unit length were calculated for Clear Creek as 21% of Cottonwood Creek. Of the entire mapped 8 miles rearing extent in Clear Creek, 8 miles were classified as low gradient and 0 miles were classified as high gradient based on a geomorphic analysis of long profile slopes and valley widths. The area per unit length was scaled by a factor of 0.1 for the high gradient extent. There was no scaling factor applied to the low gradient extent.
There was no watershed specific hydraulic modeling available for Clear Creek. A flow to inundated floodplain area relationship was generated for Clear Creek by scaling the flow to inundated floodplain area relationship for Cottonwood Creek. This scaling used the ratio of mean flow from December to June between the modeled and unmodeled watershed. Flows and corresponding inundated floodplain areas per unit length were calculated for Clear Creek as 21% of Cottonwood Creek. Of the entire mapped 6.3 miles rearing extent in Clear Creek, 8 miles were classified as low gradient and -1.7 miles were classified as high gradient based on a geomorphic analysis of long profile slopes and valley widths. The area per unit length was scaled by a factor of 0.1 for the high gradient extent. There was no scaling factor applied to the low gradient extent.
There was no watershed specific hydraulic modeling available for Clear Creek. A flow to inundated floodplain area relationship was generated for Clear Creek by scaling the flow to inundated floodplain area relationship for Cottonwood Creek. This scaling used the ratio of mean flow from December to June between the modeled and unmodeled watershed. Flows and corresponding inundated floodplain areas per unit length were calculated for Clear Creek as 21% of Cottonwood Creek. Of the entire mapped 17.9 miles rearing extent in Clear Creek, 8 miles were classified as low gradient and 9.9 miles were classified as high gradient based on a geomorphic analysis of long profile slopes and valley widths. The area per unit length was scaled by a factor of 0.1 for the high gradient extent. There was no scaling factor applied to the low gradient extent.
The areas represent total inundated area in acres.
flow_cfs | FR_floodplain_acres | LFR_floodplain_acres | SR_floodplain_acres | ST_floodplain_acres | watershed |
---|---|---|---|---|---|
8 | 0.00 | 0.00 | 0.00 | 0.00 | Clear Creek |
84 | 0.58 | 0.57 | 0.94 | 1.01 | Clear Creek |
159 | 1.01 | 0.99 | 1.62 | 1.74 | Clear Creek |
234 | 1.61 | 1.58 | 2.60 | 2.79 | Clear Creek |
310 | 2.13 | 2.08 | 3.43 | 3.68 | Clear Creek |
… with 27 more rows