Dutch Flat Afterbay (elevation 2,471 feet)

Dutch Flat Afterbay is an instream reservoir on the Bear River. Both Dutch Flat #1 (PG&E) and Dutch Flat #2 (NID) powerhouses discharge into the afterbay.

Made of earth-rock, it is165 feet high and 495 in length.

The afterbay was constructed in 1964-65 as part of the Yuba-Bear Hydroelectric Project.

Storage capacity is 2,037 acre-feet. Dutch Flat Afterbay environmental flows go into the Bear River, with current requirements at 5-10 cubic feet per second (CFS) depending on the season. The afterbay provides the diversion in the Bear River for the Chicago Park Conduit.

 

An aerial view of Dutch Flat Afterbay shows its details: height 165 ft, crest elevation 2,755 ft, and an ungated spillway.

 

 

 

Map of the Mountain Division South Yuba Lower, showing water resources and key powerhouses like Dutch Flat and Chicago Park.
The image shows the construction of Dutch Flat Afterbay in 1965, featuring roadways and surrounding mountainous terrain.
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