Little Rock River IA 06-BSR-1800
from confluence with Argo Slough (S17 T99N R43W Lyon Co.) to the Iowa/Minnesota state line
Assessment Comments
Assessment is based on results of IDNR/UHL ambient water quality monitoring conducted in 2002 and 2003 as part of TMDL development.
Basis for Assessment
SUMMARY: The Class B(LR) aquatic life uses are assessed (evaluated) as “fully supported” based on results of ambient chemical/physical water quality monitoring conducted near the Iowa/Minnesota state line by IDNR/UHL during the 2002-2004 assessment period as part of TMDL monitoring (TMDL station 1; STORET station 11720001).
EXPLANATION: Results of chemical/physical water quality monitoring conducted by IDNR/UHL from March 2002 through December 2003 in support of TMDL development suggest relatively good water quality in this stream. None of the 21 samples collected had levels of dissolved oxygen, pH, or ammonia-nitrogen that violated state water quality standards (these samples were not analyzed for toxic metals or pesticides). These results, although somewhat limited in terms of parameter coverage, suggest "full support" of the Class B(LR) aquatic life uses.
Assessment Key Dates
| 12/15/2003 | Fixed Monitoring End Date |
| 3/18/2002 | Fixed Monitoring Start Date |
Methods
| 240 | Non-fixed station physical/chemical (conventional + toxicants) |
Monitoring Levels
| Biological | 0 |
| Habitat | 0 |
| Physical Chemistry | 2 |
| Toxic | 2 |
| Pathogen Indicators | 0 |
| Other Health Indicators | 0 |
| Other Aquatic Life Indicators | 0 |
| # of Bio Sites | 0 |
| BioIntegrity | N/A |