LOCATION.--Lat 41°33'2", long 96°5'47" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 NW 1/4 sec.8, T.18 N., R.12 E., Washington County, NE, Hydrologic Unit 10230001, downstream of bridge on U.S. Highway 30 in Blair, and 648 mi upstream from mouth. (map)

GAGE.--Water-stage recorder. Datum of gage is 977.47 ft above North American Vertical Datum of 1988. Prior to August 1, 2016, datum of gage was 977.44 ft above North American Vertical Datum of 1988 (levels by U.S. Army Corps of Engineers).

REMARKS.--Flow regulated by upstream main-stem reservoirs. Fort Randall Dam was completed in July 1952, with storage beginning in December 1952. Gavins Point Dam was completed in July 1955, with storage beginning in December 1955.

Advanced Hydrologic Prediction Service

Omaha Public Power District

U.S. Army Corps of Engineers - Omaha District