LOCATION.-- Lat. 42°08'16", long 87°47'04" (NAD of 1927), at NE¼ NW¼ sec.12, T42N, R12E, Cook County, Hydrologic Unit 07120003, 33 feet upstream of Dundee Road (sewer pipe in the Chicago Botanical Gardens).

DRAINAGE AREA.-- 23.8 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

PARTIAL RECORD: Annual maximum, water years 1962-1979; Miscellaneous discharge measurements, water year 2000.

SURFACE-WATER QUALITY

MISCELLANEOUS: Water year 2000; contaminants in streambed sediments, water year 2000.

BIOLOGICAL

ALGAE: Pigment and biomass, Water year 2000.

BENTHIC MACROINVERTEBRATES: Water year 2000.

HABITAT: Water year 2000.