USGS Water-Year Summary 2023
05453000 Big Bear Creek at Ladora, IA
LOCATION - Lat 41°44'58", long 92°10'55" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 SE 1/4 sec.12, T.80 N., R.12 W., Iowa County, IA, Hydrologic Unit 07080208, on left bank 10 ft downstream from bridge on County Highway V52, 0.4 mi south of Ladora, 1.2 mi downstream from Coats Creek, 2.8 mi upstream from Little Bear Creek, and 8.1 mi upstream from mouth.
DRAINAGE AREA - 189 mi².
REVISIONS HISTORY - WSP 1308: 1947(M). WSP 1438: Drainage area.
Revisions: Gage datum was updated to 744.54 ft NAVD88 on May 24, 2023, as determined by a GNSS Level II survey. Gage datum was previously published as 744.94 ft NGVD29 from levels.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records from October 1945 to current year. Prior to October 1966, published as "Bear Creek at Ladora".
GAGE - Water-stage recorder. Datum of gage is 744.54 ft above North American Vertical Datum of 1988. Prior to June 27, 1946, non-recording gage; prior to October 1, 1980, at datum 10.00 ft higher.