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DESCRIPTION:

Latitude 43°44'54",   Longitude 99°33'22"   NAD27

Lyman County, South Dakota, Hydrologic Unit 10140204

Drainage area: 9,915 square miles

Contributing drainage area: 9,855 square miles,

Datum of gage: 1,378.4 feet above   NAVD88.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Current / Historical Observations     (availability statement)	1990-10-01	2026-01-21
Daily Data
Discharge, cubic feet per second	1928-09-01	2026-01-20	35571
Gage height, feet	2017-09-30	2026-01-20	1958
Suspended sediment concentration, milligrams per liter	1971-10-01	2022-09-29	16801
Suspended sediment discharge, short tons per day	1971-10-01	2022-09-29	16801
Suspended sediment discharge, short tons per day	1971-10-01	2022-09-29	16801
Daily Statistics
Discharge, cubic feet per second	1928-09-01	2024-10-07	35101
Gage height, feet	2017-09-30	2024-10-07	1503
Suspended sediment concentration, milligrams per liter	1971-10-01	2022-09-28	16800
Monthly Statistics
Discharge, cubic feet per second	1928-09	2024-10
Gage height, feet	2017-09	2024-10
Suspended sediment concentration, milligrams per liter	1971-10	2022-09
Annual Statistics
Discharge, cubic feet per second	1928	2025
Gage height, feet	2017	2025
Suspended sediment concentration, milligrams per liter	1972	2022
Peak streamflow	1929-03-10	2024-06-21	96
Field measurements	1950-12-18	2025-11-24	1283
Field/Lab water-quality samples (Legacy QW is frozen as of March 2024, newer data may be found on MLP)	1946-06-05	2023-10-04	3737
Water-Year Summary	2006	2024	19
Revisions	Loading...

OPERATION:

Record for this site is maintained by the USGS South Dakota Water Science Center

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ADDITIONAL INFORMATION

National Weather Service Floodstage 15.0 ft.