Fox River IA 04-FOX-995

from unnamed tributary (NW 1/4 S6 T68N R12W Davis Co.) to confluence with unnamed tributary in S29 T69N R15W Davis 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 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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Cycle: 2022
Release Status: Final
Overall IR: 5 - Water is impaired or threatened and a TMDL is needed.
Trend: Unknown
Created: 12/14/2021 7:23:02 AM
Updated: 1/27/2022 10:21:42 AM

Use Support

Class A1

Presumptive Use

Recreation - Primary contact

Not Supported

Bacteria: Indicator Bacteria- E. coli

Support Level

Not Supported

Impairment Code

5p - Impairment occurs on a waterbody with a presumptive A1 or B(WW1) use.

Cause Magnitude

Slight

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2012

Impairment Rationale

Geometric mean criterion exceeded

Data Source

Ambient monitoring: USGS

TMDL Priority

Tier III

Class BWW2

Aquatic Life - Warm Water Type 2

Not Supported

Biological: low fish IBI

Support Level

Not Supported

Impairment Code

5b-t - Biological - tentative

Cause Magnitude

Slight

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

Low

Cycle Added

2004

Impairment Rationale

Low Biotic Index

Data Source

Biological monitoring: Iowa DNR WQMA

TMDL Priority

Tier IV

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The presumptive Class A1 use was assessed as “not supported” due to 2009 levels of indicator bacteria that exceeded state water quality criteria. The Class BWW2 use was assessed as "not supported" based on biological sampling data.

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	300	Fox River	Bloomfield – REMAP #48
USGS	11	WQ	CY 2009	5494200	Fox River near West Grove, IA
USGS	11	WQ	CY 2009	5494250	Fox River near Paris, IA
USGS	11	WQ	CY 2009	5494300	Fox River at Bloomfield, IA
USGS	11	WQ	CY 2009	5494350	Fox River at Co HWY J40 near Bloomfield, IA

Presumptive Class A1 – No Data

Site ID	Data Source ID	# Samples / # Years	2009 Geometric Mean	Annual Geometric Mean Violation	# Violations	% Violations	Significantly >10% Violations	Assessment Type	Support Level
5494200	11	8 / 1	202	Yes	2	25%	Unknown (<10 samples)	Evaluated	Not
5494250	11	8 / 1	214	Yes	1	12%	Unknown (<10 samples)	Evaluated	Not
5494300	11	8 / 1	336	Yes	3	38%	Unknown (<10 samples)	Evaluated	Not
5494350	11	8 / 1	305	Yes	1	12%	Unknown (<10 samples)	Evaluated	Not

Class BWW2 - Biological Sampling:

Benthic Macroinvertebrates:

Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage	BM Sample Gear	BMIBI score	BMIBI Class	40a BMIBI BIT	BMIBI Pass/ Fail
300	7/29/19	101.1	40a	MS	Art Sub	59	Good	41	Pass
300	7/15/13	101.1	40a	MS	Art Sub	16	Poor	41	Fail

Fish:

Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage	Riffle Stream?	FIBI score	FIBI Class	40a FIBI BIT	FIBI Pass/ Fail
300	7/29/19	101.1	40a	MS	NA	34	Fair	33	Pass
300	7/15/13	101.1	40a	MS	NA	20	Poor	33	Fail

Overall:

Community	Assessment Type	Assessment Result	Support Level	IR Category	Reason
Benthic Macroinvertebrates	Evaluated	Fail (1/2)	Not
Fish	Evaluated	Fail (1/2)	Not	5bt	Assessment was evaluated because samples greater than five years old
Overall	Evaluated	Fail	Not		were used to complete the assessment.

Class BWW2- Continuous DO Monitoring:

Site ID	Data Source ID	# Days Monitoring (2016/2017/2018/ 2019/2020)	DO Criteria Type	# 2016 violations / Violations needed for impairment	# 2017 violations / Violations needed for impairment	# 2018 violations / Violations needed for impairment	# 2019 violations / Violations needed for impairment	# 2020 violations / Violations needed for impairment	Violates Annual Significantly >10% Rule?	Assessment Type	Support Level
			24 hr	NA	2/4	NA	0/4	NA	No
300	6	0/16/0/15/0	16 hr	NA	1/4	NA	0/4	NA	No	Monitored	Full

Monitoring and Methods

Assessment Key Dates

7/29/2019

Biological Monitoring

7/15/2013

Biological Monitoring

3/2/2009

Non-fixed Monitoring Start Date

12/6/2009

Non-fixed Monitoring End Date

Methods

150

Monitoring data more than 5 years old

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

330

Fish surveys

380

Quantitative physical habitat assessment

420

Indicator bacteria monitoring