Belva Deer Lake IA 03-NSK-6241

approximately 5 miles NE of Sigourney (T76N R11W Secs 21 16 17 Keokuk 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: Eutrophic
Trend: Stable
Created: 11/1/2023 8:13:41 AM
Updated: 12/28/2023 7:16:01 AM

Use Support

Class BLW

Aquatic Life - Lakes and wetlands

WINOFI

Algal Growth: Cyanobacteria

Support Level

Further Investigation Needed

Impairment Code

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

Cause Magnitude

Slight

Status

New

Source

Agriculture

Source Confidence

Low

Cycle Added

2024

Impairment Rationale

Adverse impacts on plant/animal communities

Data Source

Ambient monitoring: Iowa DNR-lakes

Class HH

Human Health -

Fully Supported

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

Belva Deer Lake is not designated for the Class A1 use in the Iowa Surface Water Classification. The Class BLW use was assessed (evaluated) as “WINOFI” due to cyanobacteria blooms. The Class HH use was assessed (monitored) as “fully supported” based on turtle 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 2018-2022	22540001	Lake Belva Deer
Iowa DNR	6	FT	See Below	1352	Lake Belva Deer	Belva Deer Campground

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
22540001	6	Dissolved Oxygen	15 / 5	4.8	13.1	8.4	1	NA / NA	4	NO	Mon	Full
22540001	6	pH	15 / 5	7.2	9.2	8.4	3	NA / NA	4	NO	Mon	Full
22540001	6	Temperature	15 / 5	18.8	30.5	23.8	0	NA / NA	4	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
22540001	6	6	1005.96663	100%	64.37625627	94%	YES	Evaluated	3b

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
22540001	6	Ammonia	15 / 5	0.2101	0.04	0.02	0 / 0	NO	Mon	Full

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)
1352	shoulder	2016	snapping turtle	4	32.7	0.06	0.02	0.06
Support Level	Full

Additional Information - 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
22540001	6	Chlorophyll a TSI	15 / 5	37	70	63	NA	NA	NA
22540001	6	Secchi TSI	15 / 5	49	75	67	NA	NA	NA
22540001	6	Total Phosphorus TSI	15 / 5	55	70	62	NA	NA	NA
22540001	6	Inorganic suspended solids	15 / 5	0.6	10	1.9	NA	NA	NA

Monitoring and Methods

Assessment Key Dates

6/11/2018

Monitoring Start

9/25/2022

Monitoring End

9/23/2016

Fish Tissue Monitoring

Methods

200

Physical/Chemical Monitoring

260

Fish tissue analysis

340

Primary producer surveys (phytoplankton/periphyton/macrophyton)