Twelve Mile Creek Lake IA 05-GRA-1367
Union County S12T72NR30W approx 4 mi E of Creston.
Assessment Comments
Basis for Assessment
Used assessments of support developed for the 1994 and 1996 reports for the Class B(LW) aquatic life uses (=FST), and Class C drinking water uses (=FST). Due to lack of information, continue to not assess support of the Class A primary contact recreation uses. Based on results of the sampling for the 1996 Regional Ambient Fish Tissue (RAFT) monitoring program, assessed support of fish consumption uses as fully supporting: levels of all contaminants in the composite samples of fillets of crappie and channel catfish were below 1/2 of the respective FDA action levels. In the March/April 1998 Iowa Conservationist, Twelvemile Lake was identified as one of the best fishing lakes in southwest Iowa, with excellent populations of bluegill, largemouth bass, walleye/saugeye, and channel catfish.
Assessment Key Dates
| 7/14/1996 | Biological Monitoring |
Methods
| 340 | Primary producer surveys (phytoplankton/periphyton/macrophyton) |
| 120 | Surveys of fish and game biologists/other professionals |
| 222 | Non-fixed-station monitoring (conventional during key seasons and flows) |
| 260 | Fish tissue analysis |
| 270 | PWS chemical monitoring (ambient water) |
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 | Use Support | Cause Magnitude | Sources | Source Magnitude |
|---|---|---|---|---|
| Nutrients | Overall Use Support | Not Impairing |
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| Nutrients | Aquatic Life Support | Not Impairing |
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| Nutrients | Primary Contact Recreation | Not Impairing |
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| Siltation | Overall Use Support | Not Impairing |
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| Siltation | Aquatic Life Support | Not Impairing |
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