Black Hawk Creek IA 02-CED-546
from Hwy 58 (E 1/2 S27 T88N R14W Black Hawk Co.) to confluence with N. Fk. Black Hawk Cr. in S1 T87N R15W Grundy Co.
Assessment Comments
Assessment based on 1996 biocriteria: 20 fish spp., 5 fams., Fish IBI= 51(good), BM-IBI= 50(fair).
Basis for Assessment
Used results of the July 1996 DNR biocriteria sampling 2.5 mi SW of Hudson to assess support of the Class B(WW) aquatic life uses as FST due to (1) presence of a relatively diverse fish community (20 species from 5 families) that contains most of the expected taxa for streams in the Iowan Surface subecoregion (9 of 11), (2) no violations of Class B(WW) WQ criteria in the sample collected during biocriteria sampling, (3) no violations of Class B(WW) WQ criteria in samples collected for DNR quarterly monitoring between October 1993 and September 1995, and (4) presence of game fish species (channel catfish; also 1 smallmouth bass). Relatively few game fish captured, thus suggesting a potential habitat limitation in this relatively small Class B(WW) stream.
Assessment Key Dates
| 7/31/1996 | Biological 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 | 2 |
| Toxic | 0 |
| Pathogen Indicators | 0 |
| Other Health Indicators | 0 |
| Other Aquatic Life Indicators | 0 |
| # of Bio Sites | 1 |
| BioIntegrity | Fair |