Price Creek IA 02-IOW-699

from mouth of Mill Race (S26 T81N R9W Iowa Co.) to confluence with unnamed tributary in NW 1/4 S8 T81N R9W Iowa 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 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: 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
Trend: Unknown
Created: 9/3/2020 1:10:34 PM
Updated: 10/12/2020 1:06:29 PM

Use Support

Class A1

Presumptive Use

Recreation - Primary contact

Not Supported

Bacteria: Indicator Bacteria- E. coli

Support Level

Not Supported

Impairment Code

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

Cause Magnitude

High

Status

Delisted

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2010

Impairment Rationale

Geometric mean criterion exceeded

Cycle Delisted

2020

Delisting Rationale

TMDL preparation and approval

Data Source

Special project/study

Class BWW2

Aquatic Life - Warm Water Type 2

Fully Supported

General Use

General Use water -

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The presumptive Class A1 use was assessed as “not supported” due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The Class BWW2 use was assessed as "fully supported” based on biological sampling data. Note: A TMDL covering the bacteria impairments for all segments, with the segment code prefix "IA 02-IOW" in the Iowa River Basin, was approved by EPA in 2018. Due to the completion of the TMDL, the IR category for the Class A1 use was changed from 5p (impaired; TMDL needed) to 4a (impaired; TMDL approved).

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 2016-2018	13480010	Price Creek at U Ave (Site 8)
Iowa DNR	6	WQ	CY 2016-2018	13480011	Price Creek above campground (Site 9)
Iowa DNR	6	WQ	CY 2016-2018	13480012	Price Creek at Hwy 151 (Site 10)
Iowa DNR	6	WQ	CY 2016-2018	13480013	Price Creek at 220th Trail at Amana (Site 11A)
Iowa DNR	6	BIO	See Below	1098	Price Creek	Norway - Downstream

Presumptive Class A1 - Indicator Bacteria:

Site ID	Data Source ID	# Samples / # Years	2016 Geometric Mean	2017 Geometric Mean	2018 Geometric Mean	Annual Geometric Mean Violation	# Violations	% Violations	Significantly >10% Violations	Assessment Type	Support Level
13480010	6	33 / 3	527.16	736.27	676.12	Yes	28	85%	Yes	Monitored	Partial
13480011	6	31 / 3	2092.56	2866.75	4507.92	Yes	30	97%	Yes	Monitored	Not
13480012	6	32 / 3	1312.77	2179.01	3496.42	Yes	30	94%	Yes	Monitored	Not
13480013	6	32 / 3	1268.85	2129.24	2097.95	Yes	29	91%	Yes	Monitored	Not

Class BWW2 - Biological Sampling:

Fish:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage/ Thermal	Riffle Site?	FIBI score	FIBI Class	47f FIBI BIT	FIBI Pass/ Fail
1098	8/18/17	19	47f	MS/WW	NA	49	Fair	36	Pass
1098	9/14/16	19	47f	MS/WW	NA	42	Fair	36	Pass

Overall Assessment:

Community	Assessment Type	Assessment Result	Support Level	Earned IR Category	Actual IR Category	Reason
Fish	Monitored	Pass (2/2)	Full	1	1	Assessment is monitored because all samples used for the assessment were collected in the last five years.

Monitoring and Methods

Assessment Key Dates

3/14/2016

Fixed Monitoring Start Date

9/10/2018

Fixed Monitoring End Date

9/14/2016

Biological Monitoring

8/18/2017

Biological Monitoring

3/9/2018

TMDL Completed

Methods

315

Regional reference site approach

330

Fish surveys

420

Indicator bacteria monitoring