2022 assessment for Unnamed Tributary to Volga Lake Outlet

Unnamed Tributary to Volga Lake Outlet IA 01-VOL-6430

from mouth in SE1/4 S3 T93N R8W Fayette Co. to headwaters in SW1/4 S36 T94N R8W Fayette Co.

2022
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.

Open Segment Map
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Overall IR

3 - Insufficient data exist to determine whether any designated uses are met.

Trend

Unknown

Created

1/4/2022 10:50:21 AM by

Updated

1/18/2022 3:19:13 PM by

Use Support

Class A1

Presumptive Use

Recreation - Primary contact

Not Assessed

Class BWW1

Presumptive Use

Aquatic Life - Warm Water Type 1

WINOFI

Biological: low fish IBI

Support Level

Further Investigation Needed

Impairment Code

3b-u - Use potentially biologically impaired based on uncalibrated IBI metrics.

Cause Magnitude

Moderate

303(d) Listing Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

Low

Cycle Added

2016

Impairment Rationale

Low Biotic Index

Data Source

Biological monitoring: Iowa DNR WQMA

303(d) Delistings for this Cycle

No delistings for this assessment cycle.

Documentation

Assessment Summary

The presumptive Class BWW1 use was assessed as “WINOFI” based on biological sampling data. All other designated uses were "not assessed."

Assessment Explanation

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	BIO	See Below	775	Unnamed Tributary to Volga Lake Outlet	Fayette – HW#3

Presumptive Class A1 - No Data

Presumptive Class BWW1 - Biological Sampling:

Benthic Macroinvertebrates:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage/ Thermal	BM Sample Gear	BMIBI score	BMIBI Class	52b BMIBI BIT	BMIBI Pass/ Fail
775	9/20/16	1	52b	MS/WW	Surb	83	Excellent	61	Pass
775	7/18/16	1	52b	MS/WW	Surb	84	Excellent	61	Pass
775	7/18/16	1	52b	MS/WW	ArtSub	82	Excellent	61	Pass
775	9/21/15	1	52b	MS/WW	Surb	82	Excellent	61	Pass
775	9/21/15	1	52b	MS/WW	ArtSub	69	Good	61	Pass
775	8/4/15	1	52b	MS/WW	Surb	83	Excellent	61	Pass
775	8/4/15	1	52b	MS/WW	ArtSub	63	Good	61	Pass
775	9/25/14	1	52b	MS/WW	Surb	85	Excellent	61	Pass
775	9/25/14	1	52b	MS/WW	ArtSub	72	Good	61	Pass
775	7/21/14	1	52b	MS/WW	Surb	74	Good	61	Pass

Fish:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage/ Thermal	Riffle Stream?	FIBI score	FIBI Class	52b FIBI BIT	FIBI Pass/ Fail
775	9/20/16	1	52b	MS/WW	NA	18	Poor	52	Fail
775	7/18/16	1	52b	MS/WW	NA	19	Poor	52	Fail
775	9/21/15	1	52b	MS/WW	NA	29	Fair	52	Fail
775	8/4/15	1	52b	MS/WW	NA	33	Fair	52	Fail
775	9/25/14	1	52b	MS/WW	NA	23	Poor	52	Fail
775	7/21/14	1	52b	MS/WW	NA	18	Poor	52	Fail

Overall:

Community	Assessment Type	Assessment Result	Support Level	IR Category	Reason
Benthic Macroinvertebrates	Evaluated	Pass (10/10)	Full
Fish	Evaluated	Fail (0/6)	Not
Overall	Evaluated	Fail	WINOFI	3bu	Assessment was evaluated because the drainage area of the sample site was smaller than the calibrated range.

Monitoring and Methods

Assessment Key Dates

7/21/2014

Biological Monitoring

9/25/2014

Biological Monitoring

8/4/2015

Biological Monitoring

9/21/2015

Biological Monitoring

7/18/2016

Biological Monitoring

9/20/2016

Biological Monitoring

Methods

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

330

Fish surveys