Big Sioux River IA 06-BSR-1524

from confluence with Rock R. (S1 T95N R48W Sioux Co.) to confluence with Beaver Cr near Canton SD in S36 T98N R49W Lyon Co.

This is a Legacy Assessment. Prior to 2004, assessments were developed under a methodology that pre-dated the Integrated Report guidelines.

Assessment Cycle

1994

Result Period

1990 - 1992

Designations

Assessment Type

Evaluated

Integrated Report

Category 0

Legacy ADBCode

IA 06-BSR-0020_1

Overall Use Support

Partial

Aquatic Life Use Support

Threatened

Fish Consumption

Not assessed

Primary Contact Recreation

Partial

Documentation

Assessment Comments

Assessment based on monitoring conducted by South Dakota DENR at Hudson and Canton, SD.

Basis for Assessment

Over 50% of the approx 12 samples analyzed exceeded the Class A WQC for fecal coliforms; thus, assess Class A uses as PS. No violations of Class B WQC; thus suggest FS of Class B uses. Assess Class B uses as FST due to known threats from agriculture; also FST due to fishery for CCAT noted in 1994 DNR fishing guide. For 1992 report, Class A uses were assessed as FST, and Class B uses were assessed as PS: this must have been a mistake: STORET retrievals made for the 1992 report show, even with correction for high flows, that approx 45% of the samples exceeded the Class A WQC (=NS). Pattern of higest levels of fecals to occur in June, July, and August is repeated at all SDAK station in the years 1990 through 1993.