West Nishnabotna River IA 05-NSH-1441
from confluence with Silver Cr. (S21 T71N R41W Mills Co.) to confluence Farm Cr. in S9 T73N R40W Mills Co.
Assessment Comments
Assessment is based on results of IDNR ambient monthly water quality monitoring near Malvern.
Basis for Assessment
No violations of Class B(WW) WQC; thus should assess as FST due to known threats from agricultural NPS. Rivers in this portion of the state, however, are impaired due to several factors: (1) removal of riparian trees with the resultant destabilization of stream banks and habitat degradation; (2) high rates of erosion from agricultural land contribute large amounts of sediment to stream channels with resultant siltation of substrates and habitat degradation; (3) channelization that results in widening of channel and further degradation of habitat.
Assessment Key Dates
Methods
| 230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
Monitoring Levels
| Biological | 0 |
| Habitat | 0 |
| Physical Chemistry | 3 |
| Toxic | 0 |
| Pathogen Indicators | 0 |
| Other Health Indicators | 0 |
| Other Aquatic Life Indicators | 0 |
| # of Bio Sites | 0 |
| BioIntegrity | N/A |