McKinley Lake IA 05-PLA-1470

Union County S11T72NR31W at W edge of Creston.

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: 5 - Water is impaired or threatened and a TMDL is needed.
Trophic: Unknown
Trend: Unknown
Created: 8/26/2020 11:58:43 AM
Updated: 10/15/2020 7:50:46 AM

Use Support

Class A1

Recreation - Primary contact

Not Assessed

Class BLW

Aquatic Life - Lakes and wetlands

Not Assessed

Class HH

Human Health -

Partially Supported

Fish Consumption Advisory: PCBs

Support Level

Partially Supported

Impairment Code

5a - Pollutant-caused impairment. TMDL needed.

Cause Magnitude

Slight

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

Low

Cycle Added

2012

Impairment Rationale

Fish consumption advisory in effect: no more than 1 meal/week

Data Source

Fish contaminant monitoring: Iowa DNR

TMDL Priority

Tier IV

General Use

General Use water -

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The Class HH use remains assessed (monitored) as "partially supported" (IR 5a) due to the issuance of a fish consumption advisory at this lake. All other designated uses are “not assessed.”

Assessment Explanation

Sources of Data:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	WQ	CY 2018-2018	14000244	McKinley Lake

Class A1 - Indicator Bacteria: No Data

Class A1 - pH:

Site ID	Data Source ID	# Samples / # Years	Maximum Value	Mean Value	Median Value	# Violations	% Violations	Significantly >10% Violations	Assessment Type	Support Level
14000244	6	3 / 1	9.3	8.7	9	1	33%	NA	Evaluated	NA

Class A1 - Lake TSI's

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Minimum Value	Maximum Value	Median Value	Median TSI Violation	Assessment Type	Support Level
14000244	6	Chlorophyll a TSI	3 / 1	54	74	66	NA	Evaluated	NA
14000244	6	Secchi TSI	3 / 1	73	83	77	NA	Evaluated	NA
14000244	6	Total Phosphorus TSI	3 / 1	78	93	88	NA	NA	NA
14000244	6	Inorganic suspended solids	3 / 1	18	43	28	NA	NA	NA

Class BLW - Conventional Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Maximum Value	Mean Value	Median Value	# Acute / Chronic Violations	% Acute/ Chronic Violations	Significantly >10% Violations	Assessment Type	Support Level
14000244	6	Ammonia	3 / 1	0.598	0.2	0.01	0 / 0	0% / 0%	NA	Evaluated	NA
14000244	6	Dissolved oxygen	3 / 1	8.9	7.7	8.3	NA / 0	NA / 0%	NA	Evaluated	NA
14000244	6	pH	3 / 1	9.3	8.7	9	1 / NA	33% / NA	NA	Evaluated	NA
14000244	6	Temperature	3 / 1	27.5	25.2	27	0 / 0	0% / 0%	NA	Evaluated	NA

Class HH - Fish Tissue Sampling:

Date	Species Name	Biopart	# in sample	chlordane result	chlordane violation?	PCBs result	PCBs violation?	Hg result	Hg violation?	Assessment Type	Support Level
6/26/15	common carp	fillet	5	0.07	No	0.49	Yes	0.09	No	Monitored	Partial
9/3/10	common carp	fillet	3	<0.03	No	0.263	Yes	0.116	No	Evaluated	Partial
8/5/09	channel catfish	fillet	4	0.07	No	0.212	Yes	0.0825	No	Evaluated	Partial
8/5/09	largemouth bass	fillet	5					0.136	No	Evaluated	Full

Additional notes: In the late summer and fall of 2016, McKinley Lake level will be lowered for bridge replacement. Due to the lowering of the lake level fish kills may occur. A temporary relaxation of the fishing regulations will be in place to deal with the increased concentration of fish due to the decreased volume of water.

Monitoring and Methods

Assessment Key Dates

8/5/2009

Fish Tissue Monitoring

9/3/2010

Fish Tissue Monitoring

6/26/2015

Fish Tissue Monitoring

5/21/2018

Fixed Monitoring Start Date

8/13/2018

Fixed Monitoring End Date

Methods

220

Non-fixed station physical/chemical monitoring (conventional pollutant only)

260

Fish tissue analysis