Arbor Lake IA 03-NSK-864
Poweshiek County S20T80NR16W W edge of Grinnell
Assessment Comments
Assessment is based on results of water quality monitoring and surveys by IDNR Fisheries Bureau.
Basis for Assessment
SUMMARY: The Class A (primary contact recreation uses) remained assessed as "not supported." Continued to assess support of the Class B(LW) aquatic life uses as "fully supported / threatened." Fish consumption uses were "not assessed." EXPLANATION: The level of support of the Class A (primary contact recreation) uses remained assessed as "not supporting." This assessment remains based upon the statement from Bachmann et al. (1994) that swimming is prohibited at this lake due to poor water quality (see assessment developed for the 1994 report above). The previous (1998) assessment of support of the Class B(LW) uses ("fully supported / threatened") was reviewed and approved by the DNR Fisheries Bureau in 2000. The level of support of fish consumption uses was changed from "not supported" to "not assessed" due to the lack of fish contaminant monitoring at this lake. See accounts in Bachmann et al. (1980) and Bachmann et al. (1994) for more information on water quality problems at Arbor Lake.
Assessment Key Dates
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 |
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 |
|---|---|---|---|---|
| Algal Grwth/Chlorophyll a | Overall Use Support | Moderate |
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| Algal Grwth/Chlorophyll a | Primary Contact Recreation | Moderate |
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| Nutrients | Overall Use Support | Moderate |
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| Nutrients | Aquatic Life Support | Moderate |
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| Nutrients | Primary Contact Recreation | Moderate |
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| Siltation | Overall Use Support | Moderate |
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| Siltation | Aquatic Life Support | Moderate |
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