Klum Lake IA 01-NEM-66

Louisa County S25T75NR2W 2 mi. ESE of Grandview.

Open Data Collection Period Modal

For purposes of developing stream/river water quality assessments for integrated reporting, three years of water quality data are typically used for both conventional pollutant parameters (e.g., indicator bacteria) and the less frequently monitored toxic parameters (e.g., toxic metals). Since the 2004 IR cycle, DNR has used a three-year data gathering period for streams, rivers, and beaches. For most assessments, the use of three years of data increases the number of samples upon which the decision on use support is based and helps address the problem of weather-related year-to-year fluctuations in water quality.

Due to the lower sampling frequency in Iowa’s ambient lake, biological, fish kill, and fish tissue monitoring programs, five years of data are used for developing IR assessments and for identifying Section 303(d) listings.

Data Type	Data Timeframe
Beach Sampling Data	CY 2016 - 2018
Stream/River Water Quality Data	CY 2016 - 2018
Lake Water Quality Data	CY 2014 - 2018
Biological Sampling Data	CY 2014 - 2018*
Fish Kill Data	CY 2014 - 2018
Fish Tissue Sampling Data	CY 2014 - 2018
Continuous Dissolved Oxygen Sampling Data	CY 2014 - 2018
*Biological sites sampled in both 2013 and 2017 were also assessed.

Open Segment Map
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Cycle: 2020
Release Status: Final
Overall IR: 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
Trend: Unknown
Created: 9/3/2020 8:36:18 AM
Updated: 10/15/2020 12:42:50 PM

Use Support

Class BLW

Aquatic Life - Lakes and wetlands

Partially Supported

Habitat Alterations

Support Level

Partially Supported

Impairment Code

4c - Non-pollutant caused impairment. No TMDL needed.

Cause Magnitude

Moderate

Status

Continuing

Source

Hydromodification

Source Confidence

Moderate

Cycle Added

1998

Impairment Rationale

Adverse impacts on plant/animal communities

Data Source

Biological monitoring: Iowa DNR Wildlife

Class HH

Human Health -

Not Assessed

General Use

General Use water -

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The Class BLW aquatic life uses are assessed (evaluated) as "partially supported" due to hydrological modifications (flow alterations) that affect this wetland. This type of impairment is appropriate for Category 4c of Iowa's Integrated Report (i.e., impairment due to a non-pollutant stressor). All other designated uses are “not assessed.” This assessment is the same as that developed for previous assessment/listing cycles.

Assessment Explanation

Class BLW -

According to the local DNR Wildlife Biologist, this wetland is not impaired by excess nutrients from agricultural lands. Impacts from hydrological modification, however, continue. This wetland lies in a levee and drainage district, and the main drainage ditch is adjacent to the wetland basin. Deepening of the ditch and increased pumping back in the late 1960's or early 1970's completely altered Klum Lake from a mostly open semi-permanent wetland to a seasonal wetland dominated by thick stands of perennial emergent vegetation. Water is pumped into the basin in the fall for migratory waterfowl use, but this pumping does not remedy the problem. The impacts from hydrological modification at this wetland are similar to those at Allen Green Refuge Marsh. Pumping sufficient water to maintain previous wetland conditions at either wetland is not possible given (1) summer evaporation and transpiration rates, (2) current pumping capabilities, and (3) the cost of such pumping.

Class HH - Fish Tissue sampling: No Data -

In general, Iowa wetlands are not managed for recreational fisheries; thus, fish contaminant monitoring is not typically conducted at these waterbodies.

Monitoring and Methods

Assessment Key Dates

None listed

Methods

120

Surveys of fish and game biologists/other professionals