North Branch North River IA 04-LDM-1106
mouth (S35 T77N R27W. Madison Co.) to confluence with unnamed tributary in S5 T77N R29W Madison Co.
Assessment Comments
Habscrs/fshscrs=26/14, 31/12 (seine), 26/12 (shock); 1994-1997 Biocriteria: Avg. Fish IBI= 42(fair), Avg. BM-IBI= 75(good).
Basis for Assessment
Used results of four DNR biocriteria samplings at the seasonal site 4.5 mi SE of Earlham in Madison County to assess support of the Class B(LR) aquatic life uses as FST due to (1) presence of a majority (6 of 8) of the expected fish taxa for streams in the portion of the Southern Iowa Rolling Loess Prairies subecoregion in the Mississippi River drainage, (2) lack of violations of Class B(LR) water quality criteria in the samples collected during biocriteria sampling, and (3) presence of moderately diverse fish community for the subecoregion of from 11 to 13 species from 3 families.
Assessment Key Dates
| 7/28/1997 | Fixed Monitoring End Date |
| 7/1/1994 | Fixed Monitoring Start Date |
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 | Fair |