Rock Creek IA 02-CED-586
from confluence with unnamed tributary (NW 1/4 SE 1/4 S17 T97N R17W Mitchell Co.) confluence with Goose Cr. in S35 T98N R18W Mitchell Co.
Assessment Comments
Assessment is based on results on 1996 biocriteria sampling: 16 spp.; 5 fams; Fish IBI=54 (good); BM IBI=55 (fair).
Basis for Assessment
SUMMARY: The Class B(WW) aquatic life uses remain assessed as "partially supported." The assessment category, however, is changed from "monitored" to "evaluated." Fish consumption uses remain "not assessed." EXPLANATION: Continue to use the assessment developed for the 2000 report (see above) that was based on results of the 1996 IDNR biocriteria assessment. However, because these data are now considered too old (greater than five years) to accurately characterize current water quality conditions, the assessment category is changed from "monitored" (indicating an assessment with relatively high confidence) to "evaluated" (indicating an assessment with relatively low confidence). Fish consumption uses remain "not assessed" due to the lack of fish contaminant monitoring in this stream segment.
Assessment Key Dates
| 8/15/1996 | Biological Monitoring |
Methods
| 320 | Benthic macroinvertebrate 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 |
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 |