North Raccoon River IA 04-RAC-1139
from County Road M54 (S24T88N R36W Sac Co.) to confluence with Drainage Ditch 101 in S36 T91N R36W Buena Vista Co.
Assessment Comments
1992 SUA: habscr/fshscr: 25/12 (shock, 11 species); 17 spp. from 5 fams from March 1990 DNR survey.
Basis for Assessment
Used results of the September 1992 DNR stream use assessment and the March 1990 DNR fish survey at the Hwy 7 bridge near Newell to assess support of the Class B(WW) aquatic life uses as FST due to (1) habitat score (25) better than the overall median score (22) for DNR stream use assessments, (2) indications on field sheet of diverse substrate, only isolated channel alterations (despite indication of extensive straightening on maps), relatively stable stream banks, and presence of a few pool/riffle sequences in this larger wadeable stream, (3) fish score (12) equal to the 75th percentile score for stream assessment made with electrofishers, and (4) results of the March 1990 survey which showed a diverse fish community (17 species; 5 families) including adult smallmouth bass. Continued support of the aquatic life uses is threatened by upstream channelization, pasturing of riparian areas, and delivery of sediment and nutrients in nonpoint source runoff.
Assessment Key Dates
Methods
| 330 | Fish surveys |
| 375 | Visual observation-- may not quantify some parameters-- single season-- by prof. |
Monitoring Levels
| Biological | 3 |
| Habitat | 3 |
| Physical Chemistry | 0 |
| Toxic | 0 |
| Pathogen Indicators | 0 |
| Other Health Indicators | 0 |
| Other Aquatic Life Indicators | 0 |
| # of Bio Sites | 0 |
| BioIntegrity | N/A |