Iowa DNR
Iowa DNR

ADBNet

Water Quality Assessments
Impaired Waters List

Green Valley Lake IA 05-PLA-1472

Union County S26T73NR31W 2.5 mi NW of Creston.

Assessment Cycle
1996
Result Period
1992 - 1994
Designations
Assessment Type
Monitored
Integrated Report
Category 0
Legacy ADBCode
IA 05-PLA-00295-L_0
Overall Use Support
Threatened
Aquatic Life Use Support
Threatened
Fish Consumption
Fully
Primary Contact Recreation
Threatened
Drinking Water
Not assessed
Documentation
Assessment Comments

Basis for Assessment

Used assessments of support of the Class A (primary contact) uses (=FST) and Class B(LW) aquatic life uses (=FST) developed for the 1994 report.   In addtion, used info from a 1990-94 Phase III Cleans Lakes study (Hoyman and Conover 1995) to update the assessment of aquatic life uses.   Report shows that implementation of agricultural BMPs in the lake watershed and construction of sedimentation dikes at lake inlets has reduced the amount of sediment and nutrients reaching the lake and has thus improved water quality.   Report states that macrophyte biomass has increased and that WQ will likely continue to improve.   The assessment of B(LW) uses as FST is appropriate.  Also used results of fish contaminant monitoring conducted for the 1995 RAFT program to assess support of fish consumption uses as FS due to all levels of contaminants in composite samples of channel catfish and white crappie < 1/2 all FDA action levels.

Monitoring and Methods
Assessment Key Dates
Methods
340 Primary producer surveys (phytoplankton/periphyton/macrophyton)
420 Water column surveys (e.g. fecal coliform)
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 0
Toxic 0
Pathogen Indicators 0
Other Health Indicators 0
Other Aquatic Life Indicators 0
# of Bio Sites 0
BioIntegrity N/A