Volga River IA 01-VOL-296
confluence with Little Volga R. (S2 T92N R9W Fayette Co.) to confluence with unnamed tributary in SE 1/4 S24 T93N R10W Fayette Co.
Assessment Comments
Assessment based on results of IDNR/UHL biological (biocriteria) sampling in 2001 (Fish IBI= 78 (excellent), 81 (excellent), and BM-IBI= 80 (excellent), 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. A series of biological metrics which reflect stream water quality and habitat integrity were calculated from the biocriteria sampling data. The biological metrics are based on the numbers and types of benthic macroinvertebrate taxa and fish species that were collected in the stream sampling reach. The biological metrics were combined to make a fish community index of biotic integrity (F-IBI) and a benthic macroinvertebrate index (BM-IBI). The indexes rank the biological integrity of a stream sampling reach on a rising scale from 0 (minimum) to 100 (maximum). Two samples were collected within this stream segment in 2001. The Fish IBI scores were 78 (excellent) and 81 (excellent). The BM-IBI scores were 80 (excellent) and 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
9/18/2001 | Biological Monitoring |
9/17/2001 | Biological Monitoring |
Methods
220 | Non-fixed station physical/chemical monitoring (conventional pollutant only) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
330 | Fish surveys |
380 | Quan. measurements of instream parms-- channel morphology-- floodplain-- 1-2 seasons-- by prof |
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 | 2 |
BioIntegrity | Good |