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Water-Year Summary for Site 04174500

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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Available Parameters
00060 Discharge(Mean)  

Water year 2022: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2022
LOCATION - Lat 42°17'13", long 83°44'02" referenced to North American Datum of 1927, in NW 1/4 sec.28, T.2 S., R.6 E., Washtenaw County, MI, Hydrologic Unit 04090005, on left bank 100 ft upstream from bridge on Maiden Lane in Ann Arbor, 0.7 mi downstream from Argo Dam, and 4.2 mi upstream from Geddes Dam.
DRAINAGE AREA - 729 mi².
REVISIONS HISTORY - WSP 874: 1938. WSP 2112: Drainage area.
PERIOD OF RECORD - February 1904 to current year. Monthly discharge only for February 1904 to September 1914 and October 1947 to July 1948, published in WSP 1307. Published as "at Geddes" February 1904 to December 1914 and as "at Barton" January 1914 to September 1940.
GAGE - Water-stage recorder. Datum of gage is 744.40 ft above NAVD 88, converted on July 9, 2020 from NGVD 29 (levels by Michigan Department of Natural Resources). February 1904 to December 1914 at Geddes Dam, 4.2 mi downstream, and January 1914 to September 1947 at Barton Dam, 2.6 mi upstream, flow computed from records of operation of powerplants and records of depth of flow over dam and/or flow through undersluices.
REMARKS - Prior to 1955 diversion upstream from station for Ann Arbor municipal supply had negligible effect on natural flow; annual mean discharge and runoff figures adjusted for diversion from 1955 to 1991. Flow regulated by powerplants prior to May 1962. From June 1962 to 1975 occasional regulation for lake level control operations upstream from station. Since 1975 extensive regulation of flow exists due to automation of gates at dams upstream from station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,840 ft³/s, Mar. 14, 1918; maximum gage height, 17.50 ft, June 26, 1968.
AVERAGE DISCHARGE FOR PERIOD OF RECORD - Does not include water year 1948.