USGS Water-Year Summary 2021
02423555 CAHABA RIVER NEAR HELENA, AL
LOCATION - Lat 33°17'04", long 86°52'57" referenced to North American Datum of 1927, Shelby County, AL, Hydrologic Unit 03150202, on right bank at downstream side of bridge, 0.9 mi above Trigger Creek, 3 mi west of Helena, and at mile 127.1.
DRAINAGE AREA - 335 mi².
PERIOD OF RECORD - October 1995 to current year. Operated as a crest-stage gage October 1964 to September 1977 (annual peaks only).
GAGE - Water-stage recorder. Datum of gage is 403.67 ft above NGVD of 1929.
EXTREMES OUTSIDE PERIOD OF RECORD - Maximum, 22,800 ft^3/s, March 16, 1976, 34.85 feet
PERIOD OF RECORD - April 2017 to current year. (Seasonal)
PERIOD OF DAILY RECORD - WATER TEMPERATURE: April 2017 to current year (Seasonal). DISSOLVED OXYGEN: April 2017 to current year (Seasonal)
INSTRUMENTATION - Water-quality monitor.