Yellow Smoke Park Lake IA 06-BOY-1514

Crawford County S6T83NR38W 2 mi NE of Denison.

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: 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: 8/27/2020 9:46:48 AM
Updated: 10/15/2020 7:56:29 AM

Use Support

Class A1

Recreation - Primary contact

Fully Supported

Class BLW

Aquatic Life - Lakes and wetlands

Fully Supported

Class HH

Human Health -

WINOFI

Metals: Mercury

Support Level

Further Investigation Needed

Impairment Code

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

Cause Magnitude

Slight

Status

New

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2020

Impairment Rationale

Potential fish consumption advisory; additional sampling needed

Data Source

Fish contaminant monitoring: Iowa DNR

General Use

General Use water -

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The Class A1 uses are assessed (monitored) as “fully supported.” The Class BLW uses are also assessed (monitored) as “fully supported.” The Class HH uses are assessed as "partially supporting" due to the potential of a fish consumption advisory. Note: A TMDL for siltation at Yellow Smoke Lake was prepared by DNR and approved by EPA in 2002.

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 2014-2018	22240002	Yellow Smoke Lake	Lake Deep Point
Iowa DNR		FT	See Below	162	Yellow Smoke 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
22240002	6	15 / 5	8.7	8.3	8.2	0	0%	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
22240002	6	Chlorophyll a TSI	15 / 5	31	65	50	NO	Monitored	Full
22240002	6	Secchi TSI	15 / 5	32	70	42	NO	Monitored	Full
22240002	6	Total Phosphorus TSI	15 / 5	33	73	53	NA	NA	NA
22240002	6	Inorganic suspended solids	15 / 5	0.3	7.4	1.1	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
22240002	6	Ammonia	15 / 5	0.162	0.07	0.07	0 / 0	0% / 0%	NO	Monitored	Full
22240002	6	Dissolved oxygen	15 / 5	12.3	9.2	9.4	NA / 0	NA / 0%	NO	Monitored	Full
22240002	6	pH	15 / 5	8.7	8.3	8.2	0 / NA	0% / NA	NO	Monitored	Full
22240002	6	Temperature	15 / 5	28.4	23	24.8	0 / 0	0% / 0%	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 Wet Mass = 75th Percentile	Assessment Type	Support Level
22240002	6	10	15.270	46.1 %	0.142	14.3 %	NO	Evaluated	NA

Class HH - Fish Tissue Sampling:

Site ID

Date

Species Name

Biopart

# in sample

chlordane result

chlordane violation?

PCBs result

PCBs violation?

Hg result

Hg violation?

Assessment Type

Support Level

162

7/18/17

largemouth bass

plug

0.303

Yes

Monitored

Partial

162

8/4/14

largemouth bass

plug

0.194

Monitored

Full

162

9/24/12

largemouth bass

plug

0.218

Evaluated

Full

Results from the 2017 sampling show that the level of mercury in the sample exceeds the 1 meal/week trigger level (0.30 ppm) as defined in Iowa’s revised (2007) fish consumption advisory protocol. According to DNR’s assessment methodology, the single occurrence of a contaminant above an advisory trigger level neither warrants issuance of an advisory nor indicates impairment of the fish consumption uses: two consecutive samplings that show contaminant levels are above the trigger level in samples are needed to justify the issuance of an advisory. Thus, follow-up monitoring is needed.

Monitoring and Methods

Assessment Key Dates

5/20/2014

Fixed Monitoring Start Date

8/13/2018

Fixed Monitoring End Date

7/18/2017

Fish Tissue Monitoring

9/24/2012

Fish Tissue Monitoring

8/4/2014

Fish Tissue Monitoring

1/28/2002

TMDL Completed

Methods

120

Surveys of fish and game biologists/other professionals

222

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

260

Fish tissue analysis

340

Primary producer surveys (phytoplankton/periphyton/macrophyton)