03270500 Great Miami River at Dayton, OH
 LOCATION.-- Lat 39°45'55", long 84°11'51", Montgomery County, OH, Hydrologic 
     Unit 05080002, on left bank 1,000 ft downstream from Main Street bridge in Dayton, 
     0.7 mi upstream from Wolf Creek, 0.8 mi downstream from Mad River, at river mile 80.
 DRAINAGE AREA.-- 2,511 mi2.
 PERIOD OF RECORD.-- April to September 1905, January to September 1906, January 1907 to 
     December 1909 (gage heights only), April 1913 to current year. Monthly discharge only 
     for October 1919 to September 1921, published in WSP 1305. Gage-height records collected 
     at Main Street bridge since January 1892 are contained in reports of National Weather 
     Service. Prior to October 1962, published as Miami River at Dayton.
 REVISED RECORDS.-- WSP 1385: 1917. WSP 1908: Drainage area.
 REMARKS.-- Flood flow regulated by four retarding basins upstream from station beginning in 1920, 
     Huffman on the Mad River 6.4 mi upstream, Englewood on the Stillwater River 10.9 mi upstream, 
     Taylorsville on the Great Miami River 10.9 mi upstream, and Lockington on Loramie Creek 41 mi 
     upstream. Also, low flow slightly regulated by Lake Loramie, Indian Lake, and C.J. Brown Reservoir; 
     see REMARKS for station 03261500, 03262000, and 03269500. Recharge to the wellfields for the 
     City of Dayton and Montgomery County suburbs is largely induced infiltration from the Great Miami 
     and Mad rivers. Groundwater pumpage upstream from the station is returned to the river as treated 
     wastewater 4.8 mi downstream from the station, 9.3 mi downstream from the station, and a small 
     amount diverted to the Little Miami River watershed through the county regional system. This pumpage 
     could affect low flow. Sediment data formerly collected at this site.
 EXTREMES OUTSIDE PERIOD OF RECORD.-- Flood of Mar. 26, 1913, reached a stage of 29.0 ft, site 
     and datum then in use; discharge, 250,000 ft3/s, computed by Miami Conservancy District.