West Lake Corning IA 05-NOD-1394
Alternate name(s) for this segment: City Reservoir
Adams County S26T72NR34W at N edge of Corning.
- Cycle
- 2018
- Release Status
- Final
- Overall IR
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trophic
- Unknown
- Trend
- Unknown
- Created
- 6/6/2019 2:38:26 PM
- Updated
- 6/6/2019 2:44:16 PM
The Class B(LW) aquatic life are assessed (evaluated) as “fully supported” based on results of sampling and analysis of this lake’s fish populations in 2003. The Class C (drinking water) uses remain “not assessed” due to the lack of recent information upon which to base an assessment. This lake is not designated for contact recreation uses in Iowa's Surface Water Classification (http://www.iowadnr.gov/water/standards/files/swcdoc2.pdf). The fish consumption uses remain assessed (monitored) as "fully supported" based on fish tissue monitoring in 2007. The sources of data for this assessment include (1) results of lake fish surveys by the IDNR Fisheries Bureau in 2003 and (2) results of U.S. EPA/IDNR fish contaminant (RAFT) monitoring in 2007. This lake is not part of the IDNR/ISU, 2000-2007 statewide survey of Iowa lakes nor has this lake been monitored as part of the IDNR/UHL 2005-2008 ambient monitoring program.
The Class B(LW) aquatic life uses of West Corning Lake will be changed to “not assessed” due to the lack of recent monitoring data upon which to base an assessment. In previous 305(b) assessment cycles, the Class B(LW)uses were assessed(evaluated) as “fully supported.” based on sampled fish population of this lake September 8, 10, and 17, 2003. The Class C (drinking water) uses remain “not assessed” due to the lack of recent monitoring data upon which to base an assessment. In previous 305(b) assessment cycles, the Class C uses were assessedas "fully supported/threatened” (not impaired) based on results of sampling conducted by UHL in January 1995. These data, however, are now far greater than 10 years in age and are thus considered too old to accurately characterize current water quality conditions. Note:A TMDL for siltation at West Lake Corning was prepared by DNR and approved by EPA in 2001.
Fish consumption uses remain assessed (monitored) as “fully supported” based on results of U.S. EPA/DNR fish contaminant (RAFT) monitoring at West Corning Reservoir in 2007. The composite samples of fillets from channel catfish and an unknown fish had low levels of contaminants. Levels of primary contaminants in the composite sample of channel catfish fillets were as follows: mercury: 0.0181 ppm; total PCBs: 0.09 ppm; and technical chlordane: <0.03 ppm. Levels of primary contaminants in the composite sample of the unknown fish fillets were as follows: mercury: 0.0426 ppm. The existence of, or potential for, a fish consumption advisory is the basis for Section 305(b) assessments of the degree to which Iowa’s lakes and rivers support their fish consumption uses. The fish contaminant data generated from the 2007 RAFT sampling conducted at this lake show that the levels of contaminants do not exceed any of the advisory trigger levels, thus indicating no justification for issuance of a consumption advisory for this waterbody.