Fairfield Reservoir 2 IA 03-SKU-910

Alternate name(s) for this segment: Pleasant Lake | Fairfield Municipal Reservoir 2

Jefferson County SE 1/4S24T72NR10W near Fairfield.

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 2014 - 2016
Stream/River Water Quality Data	CY 2014 - 2016
Lake Water Quality Data	CY 2012 - 2016
Biological Sampling Data	CY 2012 - 2016*
Fish Kill Data	CY 2012 - 2016
Fish Tissue Sampling Data	CY 2012 - 2016
Continuous Dissolved Oxygen Sampling Data	CY 2012 - 2016
*Biological sites sampled in both 2011 and 2015 were also assessed.

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Cycle: 2018
Release Status: Final
Overall IR: 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
Trophic: Unknown
Trend: Unknown
Created: 6/11/2019 12:50:29 PM
Updated: 6/11/2019 12:50:41 PM

Use Support

Class BLW

Aquatic Life - Lakes and wetlands

Partially Supported

Sedimentation/Siltation

Support Level

Partially Supported

Impairment Code

4a - Pollutant-caused impairment. TMDL has been completed.

Cause Magnitude

Moderate

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2012

Impairment Rationale

Adverse impacts on plant/animal communities

Data Source

TMDL monitoring: Iowa DNR

Class C

Drinking Water -

Not Assessed

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 B(LW) aquatic life uses and fish consumption uses both remain "not assessed" due to the lack of information upon which to base an assessment. The Class C (drinking water) are "not assessed" due to the lack of recent information upon which to base an assessment. The data used for previous assessments of the Class C uses of this lake ["fully supported/threatened" (not impaired)] are now considered too old (greater than 10 years) to accurately characterize current water quality conditions.

Assessment Explanation

The Class B(LW) aquatic life uses remain assessed (evaluated) as "partially supporting" due to siltation impacts. Because a TMDL for siltation impacts at this lake was prepared and approved, the Class B(LW) uses remain in Category 4a (TMDL approved) of Iowa’s Integrated Report. This lake is not part of Iowa’s ambient lake water quality monitoring programof 1328Iowa lakes.

The Class C (drinking water) uses are considered "not assessed" due to the lack of information upon which to base an assessment. The previous assessments of the Class C uses at this lake ["fully supported/threatened" (not impaired)] were based on results of sampling conducted by UHL in January 1995. However, because these data are now considered too old (greater than ten years) to accurately characterize current water quality conditions, these uses are now considered "not assessed."

Fish consumption uses remain "not assessed" due to the lack of fish contaminant monitoring at this lake.

Note:A TMDL for siltation in this lake, as impairing aquatic life uses, was prepared by DNR and approved by U.S.EPA in 2001.

Monitoring and Methods

Assessment Key Dates

8/28/2001

TMDL Completed

Methods

100

QUALITATIVE (EVALUATED) ASSESSMENT - UNSPECIFIED