Future Data Improvements
None planned.
Instream Spawning and Rearing Habitat
No watershed specific instream spawning or rearing habitat data was available for Mill 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: Scaled from a Deer Creek flow to floodplain area relationship generated with a 2D HEC-RAS hydraulic model. See Deer Creek HSI modeling documentation for more details.
Fall Run
There was no watershed specific hydraulic modeling available for Mill Creek. A flow to inundated floodplain area relationship was generated for Mill Creek by scaling the flow to inundated floodplain area relationship for Deer 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 Mill Creek as 98% of Deer Creek. Of the entire mapped 21.1 miles rearing extent in Mill Creek, 7.5 miles were classified as low gradient and 13.6 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.
Spring Run and Steelhead
There was no watershed specific hydraulic modeling available for Mill Creek. A flow to inundated floodplain area relationship was generated for Mill Creek by scaling the flow to inundated floodplain area relationship for Deer 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 Mill Creek as 98% of Deer Creek. Of the entire mapped 53.5 miles rearing extent in Mill Creek, 7.5 miles were classified as low gradient and 46 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.
Floodplain Data
The areas represent total inundated area in acres.
| flow_cfs | FR_floodplain_acres | SR_floodplain_acres | ST_floodplain_acres | watershed |
|---|---|---|---|---|
| 884 | 0.00 | 0.00 | 0.00 | Mill Creek |
| 982 | 4.25 | 7.50 | 7.50 | Mill Creek |
| 2945 | 60.76 | 107.27 | 107.27 | Mill Creek |
| 4909 | 104.29 | 184.13 | 184.13 | Mill Creek |
| 5891 | 119.66 | 211.28 | 211.28 | Mill Creek |
… with 8 more rows
Floodplain Plot
