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

1996

Result Period

1992 - 1994

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

Used results of water quality monitoring at Hudson and Canton to assess support of Class A (primary contact uses) as PS due to high levels of fecal coliform bacteria; i.e., 5 of 8 samples collected during recreational seasons of 1994 and 1995 exceeded the Class A WQ criterion. Class B(WW) aquatic life uses were assessed as FST due to lack of violations of Class B(WW) water quality criteria. Levels of total dissolved solids tend to be high and tend to exceed the 750 mg/l WQ criterion for general use waters (34 of 70 samples (49%) exceeded the general use criterion). All monitoring stations on the Big Sioux R. report similar levels of TDS; sources believed to be natural.