West Okoboji Lake - Main Basin South IA 06-LSR-1653

portion of West Okoboji Lake south of Manhattan Beach on the western shore and Omaha Beach on the eastern shore; approximate center of basin is in SW 1/4 S24T99NR37W Dickinson Co.

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 2020 - 2022
Stream/River Water Quality Data	CY 2020 - 2022
Lake Water Quality Data	CY 2018 - 2022
Biological Sampling Data	CY 2018 - 2022*
Fish Kill Data	CY 2018 - 2022
Fish Tissue Sampling Data	CY 2018 - 2022
Continuous Dissolved Oxygen Sampling Data	CY 2018 - 2022
*Biological sites sampled in both 2017 and 2021 were also assessed.

Open Segment Map
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Cycle: 2024
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: Mesotrophic
Trend: Stable
Created: 11/1/2023 8:13:43 AM
Updated: 1/24/2024 3:40:13 PM

Use Support

Class A1

Recreation - Primary contact

Fully Supported

Class BLW

Aquatic Life - Lakes and wetlands

WINOFI

Exotic/Invasive Species: Exotic Species

Support Level

Further Investigation Needed

Impairment Code

3b - Use potentially impaired based on an evaluated assessment.

Cause Magnitude

Slight

Status

Continuing

Source

Other: Exotic Species

Source Confidence

High

Cycle Added

2016

Impairment Rationale

Adverse impacts on plant/animal communities

Data Source

Biological monitoring: Iowa DNR Fisheries

Class C

Drinking Water -

Fully Supported

Class HH

Human Health -

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The Class A1 use was assessed (monitored) as “fully supported.” The Class BLW use was assessed (evaluated) as “WINOFI” due to an invasive species introduction (Zebra Mussels). The Class C use was assessed (monitored) as “fully supported” based on water quality monitoring data and drinking water compliance monitoring required by the DNR. The Class HH (fish consumption) use was assessed (monitored) as “fully supported” based on fish tissue sampling data.

Assessment Explanation

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	WQ	CY 2020-2022	21300001	Gull Point Beach
Iowa DNR	6	WQ	CY 2018-2022	22300009	West Okoboji Lake
Iowa DNR	6	FT	See below	1090	West Okoboji Lake	N of Milford

Class A1 - Indicator Bacteria:

Site ID

Data Source ID

# Samples per Year (2020/ 2021/2022)

2020 Geometric Mean

2021 Geometric Mean

2022 Geometric Mean

Violates Annual Geometric Mean?

# 2020 SSM violations / SSM Violations needed for impairment

# 2021 SSM violations / SSM Violations needed for impairment

# 2022 SSM violations / SSM Violations needed for impairment

Violates Annual SSM Significantly >10% Rule?

Assessment Type

Support Level

21300001

15/15/15

2 / 4

1 / 4

0 / 4

Mon

Full

Class A1 - pH

Site ID	Data Source ID	# Samples / # Years	Minimum Value	Maximum Value	Mean Value	# Violations	Violations needed for impairment	Violates Significantly >10% Rule?	Assessment Type	Support Level
21300001	6	29 / 2	8.04	8.76	8.43	0	6	NO	Mon	Full
22300009	6	12 / 4	8.03	8.56	8.24	0	4	NO	Mon	Full

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
22300009	6	Chlorophyll a TSI	15 / 5	26	47	31	NO	Mon	Full
22300009	6	Secchi TSI	14 / 5	27	56	33	NO	Mon	Full
22300009	6	Total Phosphorus TSI	15 / 5	34	57	37	NA	NA	NA
22300009	6	Inorganic suspended solids	15 / 5	0.6	7	1.7	NA	NA	NA

Class BLW - Binomial Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Minimum Value	Maximum Value	Mean Value	# Violations	# Acute / Chronic Violations	Violations needed for impairment	Violates Significantly >10% Rule?	Assessment Type	Support Level
21300001	6	Dissolved Oxygen	29 / 2	7.27	11.98	9.27	0	NA / NA	6	NO	Mon	Full
22300009	6	Dissolved Oxygen	13 / 5	6.7	12.8	8.5	0	NA / NA	4	NO	Mon	Full
21300001	6	pH	29 / 2	8.04	8.76	8.43	0	NA / NA	6	NO	Mon	Full
22300009	6	pH	12 / 4	8.03	8.56	8.24	0	NA / NA	4	NO	Mon	Full
21300001	6	Temperature	29 / 2	12.9	27.7	23.2	0	NA / NA	6	NO	Mon	Full
22300009	6	Temperature	13 / 5	13.1	26.3	21.1	0	NA / NA	4	NO	Mon	Full

Class BLW - Toxic Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Maximum Value	Mean Value	Median Value	# Acute / Chronic Violations	>1 Acute / Chronic Violation	Assessment Type	Support Level
22300009	6	Ammonia	12 / 4	0.293	0.04	0.01	0 / 0	NO	Mon	Full

Class BLW - Lake Planktonic Cyanobacteria:

Site ID	Data Source ID	# Samples	Maximum Cyanobacteria Wet Mass	Maximum Cyanobacteria % Composition	Median Cyanobacteria Wet Mass	Median Cyanobacteria % Composition	Median Cyanobacteria Concentration = 75th Percentile	Assessment Type	Support Level
22300009	6	3	14.97217604	95%	0.025752765	9%	NO	Evaluated	NA

Class BLW - Additional Information

The Class BLW use was assessed (evaluated) as “WINOFI” based on information from the DNR Fisheries Bureau and results from the ISU lake surveys. Based on information from the DNR Fisheries Bureau, this lake was infested with Zebra mussels in 2012 and the population exploded in 2015. This invasive species will likely cause water quality to degrade in the future. This potential impairment is not appropriate for Iowa’s Section 303(d) list of impaired waters (Integrated Report Category 5) but is appropriate for IR Category 3b of Iowa’s Integrated Report and Iowa’s list of waters in need of further investigation.

Class C - Binomial Parameters:

Site ID	Data Source ID	Parameter Name	# Samples / # Years	Minimum Value	Maximum Value	Mean Value	Median Value	# Violations	Violates Significantly >10% Rule?	Assessment Type	Support Level
22300009	6	Inorganic nitrogen (nitrate and nitrite)	14 / 5	0.02	2.32	0.22	0.03	0	NO	Mon	Full
21300001	6	pH	29 / 2	8.04	8.76	8.43	8.45	0	NO	Mon	Full
22300009	6	pH	12 / 4	8.03	8.56	8.24	8.2	0	NO	Mon	Full

Class C - Iowa Drinking Water Compliance Report:

Compliance monitoring required by the DNR Water Supply Section did not show violations of finished water caused by source water at the Central Water System, Milford Municipal Utilities, and Wahpeton Water Supply facilities during the 2020-22 monitoring period. The results of compliance monitoring required by the DNR Water Supply Operations and Engineering Sections as reported in annual compliance reports are available at the following location at the Iowa DNR’s home page: https://www.iowadnr.gov/Environmental-Protection/Water-Quality/Water-Supply-Engineering/Annual-Compliance-Report.

Class HH - Fish Tissue Sampling:

Site ID	Biopart	Year	Species	# in sample / # of samples	Avg Length (cm)	(Avg) Hg (ppm)	Chlordane (ppm)	Sum PCBs (ppm)
1090	tissue plug	2021	black crappie	4		0.086
1090	tissue plug	2021	yellow bass	1		0.237
Support Level	Full

Monitoring and Methods

Assessment Key Dates

5/29/2018

Monitoring Start

9/11/2022

Monitoring End

4/19/2021

Fish Tissue Monitoring

4/13/2021

Fish Tissue Monitoring

Methods

120

Surveys of fish and game biologists/other professionals

200

Physical/Chemical Monitoring

260

Fish tissue analysis

275

Drinking water compliance reports

340

Primary producer surveys (phytoplankton/periphyton/macrophyton)

420

Indicator bacteria monitoring