Future Data Improvements

None planned.

Instream Spawning and Rearing Habitat

Data Source: Calculated with a relationship between flow and mean weighted usable area from watersheds in the region with modeled habitat

No watershed specific instream spawning or rearing habitat data was available for Big Chico Creek. Instream spawning and rearing data were developed using similar watersheds in the Upper-mid Sacramento River Region to create a regional approximation.

Floodplain Rearing Habitat

Data Source: Central Valley Floodplain Evaluation and Delineation (CVFED) HEC-RAS hydraulic model

Fall Run

A 8.7 mile portion of the entire mapped rearing extent of 15.1 miles was modeled using Central Valley Floodplain Evaluation and Delineation (CVFED) HEC-RAS hydraulic model. Of the entire mapped rearing extent, 15.1 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 floodplain area per unit length was determined for the modeled extent and used to approximate areas for the non-modeled extent. 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.

Spring Run and Steelhead

A 8.7 mile portion of the entire mapped rearing extent of 23.8 miles was modeled using Central Valley Floodplain Evaluation and Delineation (CVFED) HEC-RAS hydraulic model. Of the entire mapped rearing extent, 15.1 miles were classified as low gradient and 8.7 miles were classified as high gradient based on a geomorphic analysis of long profile slopes and valley widths. The floodplain area per unit length was determined for the modeled extent and used to approximate areas for the non-modeled extent. 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.

Floodplain Data

The areas represent total inundated area in acres.

Header Descriptions: flow_cfs = flow in cubic feet per second, FR_floodplain_acres = Fall Run Chinook floodplain acres, SR_floodplain_acres = Spring Run Chinook floodplain acres, ST_floodplain_acres = Steelhead floodplain acres, watershed = section of stream modeled for CVPIA SDM
flow_cfs FR_floodplain_acres SR_floodplain_acres ST_floodplain_acres watershed
815 0.00 0.00 0.00 Big Chico Creek
865 1.95 2.07 2.07 Big Chico Creek
915 4.62 4.89 4.89 Big Chico Creek
965 7.58 8.02 8.02 Big Chico Creek
1015 11.08 11.73 11.73 Big Chico Creek

…with 2 more rows.

Floodplain Plot