Des Moines River IA 04-LDM-1020
upper end of Red Rock Reservoir (W line S34 T77N R20W Marion Co.) to confluence with South R. in S12 T77N R22W Warren Co.
This is a Legacy Assessment. Prior to 2004, assessments were developed under a methodology that pre-dated the Integrated Report guidelines.
Assessment Cycle
1994
Result Period
1990 - 1992
Designations
Assessment Type
Monitored
Integrated Report
Category 0
Legacy ADBCode
IA 04-LDM-0040_1
Overall Use Support
Partial
Aquatic Life Use Support
Threatened
Fish Consumption
Threatened
Primary Contact Recreation
Partial
Documentation
Assessment Comments
Assessment is based on IDNR ambient monthly city monitoring dstr from Des Moines.
Basis for Assessment
Class B uses assessed as FST due to lifting of fish consumption advisory in April 1993 due to declining levels of tech. chlordane (although levels are still > 1/2 FDA action level). Class A uses assessed as PS (an improvement): 5 of 7 samples coll at approx average flows exceeded Class A WQC, but levels of FCB have declined considerably possibly due to upgrades at DM WWTP; too few non-flow affected data from Runnell station to make assessment. Continue to have 50-60% viol of Hg criterion.
Monitoring and Methods
Assessment Key Dates
| 9/18/2001 | Fixed Monitoring End Date |
| 10/5/1999 | Fixed Monitoring Start Date |
Methods
| 420 | Water column surveys (e.g. fecal coliform) |
| 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 |
Causes and Sources of Impairment
| Causes | Use Support | Cause Magnitude | Sources | Source Magnitude |
|---|---|---|---|---|
| Pathogens | Overall Use Support | Moderate |
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| Pathogens | Primary Contact Recreation | Moderate |
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