Little Rock River IA 06-BSR-1799
from confluence with Otter Cr. (NW 1/4 S21 T98N R44W Lyon Co.) to confluence with Argo Slough in S17 T99N R43W 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
1998
Result Period
1994 - 1996
Designations
Assessment Type
Monitored
Integrated Report
Category 0
Legacy ADBCode
IA 06-BSR-0060_2
Overall Use Support
Threatened
Aquatic Life Use Support
Threatened
Documentation
Assessment Comments
Assessment is based on results of 1996 Biocriteria sampling: Fish IBI=40 (fair).
Basis for Assessment
Used results of the Sept. 1996 DNR biocriteria sampling approximately 1.5 mi E of George to assess support of the Class B(LR) aquatic life uses as FS due to (1) presence of a relatively diverse fish community of 17 species from 5 families, (2) presence of nearly all of the expected fish taxa (8 of 9) for streams in the Northwest Iowa Loess Prairies subecoregion, and (3) lack of violations of Class B(LR) WQ criteria in the sample collected during biocriteria sampling.
Monitoring and Methods
Assessment Key Dates
| 9/5/1996 | Biological Monitoring |
Methods
| 220 | Non-fixed station physical/chemical monitoring (conventional pollutant only) |
| 315 | Regional reference site approach |
| 330 | Fish surveys |
| 380 | Quan. measurements of instream parms-- channel morphology-- floodplain-- 1-2 seasons-- by prof |
Monitoring Levels
| Biological | 3 |
| Habitat | 4 |
| Physical Chemistry | 1 |
| Toxic | 0 |
| Pathogen Indicators | 0 |
| Other Health Indicators | 0 |
| Other Aquatic Life Indicators | 0 |
| # of Bio Sites | 1 |
| BioIntegrity | Fair |