West Branch Buttrick Creek IA 04-RAC-1151
mouth (W25 T84N R30W Greene Co.) to confluence with DD-52 in SE 1/4 S16 T86N R30W Webster Co.
Assessment Comments
Assessment based on results of IDNR/UHL biological (biocriteria) monitoring in 2001: Fish IBI= 62 (good), BM-IBI= 73 (good).
Basis for Assessment
SUMMARY: The Class B(LR) aquatic life uses are assessed (monitored) as "fully supported" based on results of IDNR/UHL biological (biocriteria) sampling in 2001. This is the same assessment as that developed for the 2002 reporting cycle.
EXPLANATION: This assessment was based on data collected in 2001 as part of the DNR/UHL stream biocriteria project. The 2001 Fish IBI score was 62 (good) and the BM-IBI score was 73 (good). The aquatic life use support was assessed as fully supporting (=FS), based on a comparison of the F-IBI and BM-IBI scores with biological assessment criteria established specifically for the 2002 Section 305(b) report. The biological assessment criteria were determined from a statistical analysis of data collected at stream ecoregion reference sites from 1994-2001.
Assessment Key Dates
| 7/23/2001 | Biological Monitoring |
| 7/23/2001 | One-time Chemical Monitoring |
Methods
| 330 | Fish surveys |
| 380 | Quan. measurements of instream parms-- channel morphology-- floodplain-- 1-2 seasons-- by prof |
| 220 | Non-fixed station physical/chemical monitoring (conventional pollutant only) |
| 315 | Regional reference site approach |
| 320 | Benthic macroinvertebrate surveys |
Monitoring Levels
| Biological | 4 |
| Habitat | 4 |
| Physical Chemistry | 1 |
| Toxic | 0 |
| Pathogen Indicators | 0 |
| Other Health Indicators | 0 |
| Other Aquatic Life Indicators | 0 |
| # of Bio Sites | 1 |
| BioIntegrity | Good |