LOCATION.--Lat 41°28'11", long 91°42'52"
referenced to North American Datum of 1927, in NW 1/4 SW 1/4 SW 1/4
sec.18, T.77 N., R.7 W., Washington County, IA, Hydrologic Unit
07080209, on right bank 30 ft upstream from bridge on State Highway
1, 0.8 mi south of Kalona, 1.1 mi upstream from Camp Creek, 4.5 mi
downstream from Smith Creek, and 17.0 mi upstream from mouth.
(map)
DRAINAGE AREA.--574 mi2.
SURFACE-WATER RECORDS
PERIOD OF RECORD.--Discharge records from September 1939 to
current year.
REVISED RECORDS.--WSP 1438: Drainage area. WSP 1558: 1940 (M),
1941. WSP 1708: 1956, 1957 (P), 1958 (P).
GAGE.--Water-stage recorder. Datum of gage is 633.45 ft above
National Geodetic Vertical Datum of 1929 (levels by U.S. Army Corps
of Engineers). Prior to December 27, 1939, non-recording gage at site
30 ft downstream at same datum.