Upper Pine Lake IA 02-IOW-760

Hardin County S4T87NR19W 0.5 mi E of Eldora.

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 2018 - 2020
Stream/River Water Quality Data	CY 2018 - 2020
Lake Water Quality Data	CY 2016 - 2020
Biological Sampling Data	CY 2016 - 2020*
Fish Kill Data	CY 2016 - 2020
Fish Tissue Sampling Data	CY 2016 - 2020
Continuous Dissolved Oxygen Sampling Data	CY 2016 - 2020
*Biological sites sampled in both 2015 and 2019 were also assessed.

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Cycle: 2022
Release Status: Final
Overall IR: 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
Trophic: Eutrophic
Trend: Stable
Created: 12/22/2021 7:44:39 AM
Updated: 2/1/2022 7:51:27 AM

Use Support

Class A1

Recreation - Primary contact

Not Supported

Algal Growth: Chlorophyll a

Support Level

Not Supported

Impairment Code

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

Cause Magnitude

Moderate

Status

Continuing

Source

Agriculture

Source Confidence

Moderate

Cycle Added

2004

Impairment Rationale

Narrative criteria violation: aesthetically objectionable conditions

Data Source

Ambient monitoring: Iowa DNR-lakes

Class BWW1

Aquatic Life - Warm Water Type 1

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 “not supported” (IR 4a) due to elevated levels of chlorophyll a (algae) that cause aesthetically objectionable conditions. The level of inorganic suspended solids was relatively low and does not suggest water quality problems due to non-algal turbidity. The Class BWW1 use was assessed as “fully supported.” Nutrient loading to the water column and siltation also remain water quality concerns at this lake. All other designated uses were “not assessed.” Note: A TMDL for siltation at Upper Pine Lake was prepared in 2002 by DNR and approved by EPA. Additionally, TMDL for the algae impairment at this lake was prepared and approved by EPA in November 2014. Because all impairments at this lake are addressed by the two TMDL's(i.e., the algae impairment), this waterbody was moved from IR Category 5a to Category 4a (impaired; TMDL not required).

Assessment Explanation

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	WQ	CY 2016-2020	22420002	Upper Pine Lake

Class A1 - Indicator Bacteria: No Data

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
22420002	6	15 / 5	7.2	9	8.3	0	4	NO	Monitored	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
22420002	6	Chlorophyll a TSI	15 / 5	36	79	65	YES	Monitored	Not
22420002	6	Secchi TSI	15 / 5	49	77	67	YES	Monitored	Not
22420002	6	Total Phosphorus TSI	15 / 5	43	75	70	NA	NA	NA
22420002	6	Inorganic suspended solids	15 / 5	0.3	19.6	4.5	NA	NA	NA

Class BWW1 - Conventional 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
22420002	6	Ammonia	15 / 5	0.003	0.387	0.12	NA	0 / 0	4	NO	Monitored	Full
22420002	6	Dissolved Oxygen	15 / 5	6.7	24.6	12.2	0	NA / NA	4	NO	Monitored	Full
22420002	6	pH	15 / 5	7.2	9	8.3	0	NA / NA	4	NO	Monitored	Full
22420002	6	Temperature	15 / 5	17.3	27.4	23.9	0	NA / NA	4	NO	Monitored	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
22420002	6	5	10.76	75.6%	1.90	9.1%	NO	Evaluated	NA

Class BWW1 - Fishkill:

According to Iowa DNR’s assessment/listing methodology, any IR 2b or 3b fish kills that occurred more than 10 years ago will be moved to IR Category 3a (not assessed) for the current (2022) IR cycle.

Class HH: No Data

Monitoring and Methods

Assessment Key Dates

6/9/2014

Fixed Monitoring Start Date

9/16/2018

Fixed Monitoring End Date

4/27/2009

Fish Kill

5/13/2003

TMDL Completed

11/3/2014

TMDL Completed

Methods

120

Surveys of fish and game biologists/other professionals

140

Incidence of spills and/or fish kills

222

Non-fixed-station monitoring (conventional during key seasons and flows)

340

Primary producer surveys (phytoplankton/periphyton/macrophyton)