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 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: 4 - Water is impaired or threatened and a TMDL has been completed or is not needed.
Trend: Unknown
Created: 11/1/2023 8:12:56 AM
Updated: 2/2/2024 2:00:08 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

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2010

Impairment Rationale

Geometric mean criterion exceeded

Data Source

Special project/study

Class BWW2

Aquatic Life - Warm Water Type 2

Fully Supported

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

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	WQ	CY 2018-2019	13480010	Price Creek at U Ave (Site 8)
Iowa DNR	6	WQ	CY 2018-2018	13480011	Price Creek above campground (Site 9)
Iowa DNR	6	WQ	CY 2018-2018	13480012	Price Creek at Hwy 151 (Site 10)
Iowa DNR	6	WQ	CY 2018-2018	13480013	Price Creek at 220th Trail at Amana (Site 11A)
Iowa DNR	6	WQ	CY 2019-2019	14000302	Price Creek Site 11
Iowa DNR	6	BIO	See Below	1098	Price Creek	Norway - Downstream

Presumptive Class A1 - Indicator Bacteria:

Site ID

Data Source ID

# Samples per Year (2018/ 2019/2020)

2018 Geometric Mean

2019 Geometric Mean

2020 Geometric Mean

Violates Annual Geometric Mean?

# 2018 SSM violations / SSM Violations needed for impairment

# 2019 SSM violations / SSM Violations needed for impairment

# 2020 SSM violations / SSM Violations needed for impairment

Violates Annual SSM Significantly >10% Rule?

Assessment Type

Support Level

13480010

9/7/0

676

1011

YES

7 / 3

YES

Monitored

Not

13480011

9/8/0

4508

3186

YES

9 / 3

8 / 3

YES

Monitored

Not

13480012

9/8/0

3496

3558

YES

9 / 3

8 / 3

YES

Monitored

Not

13480013

9/8/0

2098

3786

YES

9 / 3

8 / 3

YES

Monitored

Not

14000302

0/8/0

2803

YES

8 / 3

YES

Monitored

Not

Class BWW2 - Biological Sampling:

Fish:

Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage	Riffle Stream?	FIBI score	FIBI Class	47f FIBI BIT	FIBI Pass/ Fail
1098	8/21/20	19	47f	MS	NA	41	Fair	36	Pass
1098	9/10/19	19	47f	MS	NA	45	Fair	36	Pass
1098	8/18/17	19	47f	MS	NA	49	Fair	36	Pass
1098	9/14/16	19	47f	MS	NA	42	Fair	36	Pass

Overall:

Community	Assessment Type	Assessment Result	Support Level	IR Category	Reason
Fish	Evaluated	Pass (4/4)	Full		Assessment was evaluated because the drainage area of the sample site was
Overall	Evaluated	Pass	Full	1	smaller than the calibrated range.

Monitoring and Methods

Assessment Key Dates

5/10/2018

Monitoring Start

9/3/2019

Monitoring End

9/14/2016

Biological Monitoring

8/18/2017

Biological Monitoring

3/9/2018

TMDL Completed

9/10/2019

Biological Monitoring

8/21/2020

Biological Monitoring

Methods

150

Monitoring data more than 5 years old

315

Regional reference site approach

330

Fish surveys

420

Indicator bacteria monitoring