Middle Fork South Beaver Creek IA 02-CED-563

mouth (N 1/2 S28 T89N R17W Grundy Co.) confluence with unnamed tributary in NE 1/4 S28 T89N R18W Grundy Co. (upstream from Grundy Co.Rd. T13).

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.

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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: 9/1/2020 7:01:37 AM
Updated: 10/13/2020 6:53:22 AM

Use Support

Class A1

Presumptive Use

Recreation - Primary contact

Not Assessed

Class BWW1

Presumptive Use

Aquatic Life - Warm Water Type 1

Partially Supported

Biological: low Biological Integrity

Support Level

Partially Supported

Impairment Code

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

Cause Magnitude

Moderate

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

1998

Impairment Rationale

Adverse impacts on plant/animal communities

Data Source

Biological monitoring: Iowa DNR WQMA

General Use

General Use water -

Not Assessed

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The presumptive Class BWW1 use remains assessed as "partially supported" based on biological sampling data. All other designated uses were "not assessed". Note: A TMDL for sediment and phosphorus impacts was prepared by DNR and approved by EPA in October 2007. Because all Section 303(d) impairments identified for this stream segment are potentially addressed by the TMDL, this waterbody was placed in Category 4a of Iowa's 2008 Integrated Report and remains in IR Category 4a.

Assessment Explanation

Data Sources:

Data Source	Data Source ID	Data Type	Data Age	Site ID	Site Name	Site Description
Iowa DNR	6	WQ	CY 2001, CY 2003	11380003	M.F. South Beaver Creek NW of Wellsburg (45)
Iowa DNR	6	BIO	See Below	259	Middle Fork South Beaver Creek	Wellsburg – TMDL #45

Presumptive Class A1 – No Data

Presumptive Class BWW1 – 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
11380003	6	Ammonia	23 / 2	3.1	0.45	0.1	0 / 1	0% / 6%	No	Evaluated	Full
11380003	6	Dissolved oxygen	24 / 2	16.7	11	10.4	NA / 0	NA / 0%	No	Evaluated	Full
11380003	6	pH	24 / 2	8.6	8.2	8.1	0 / NA	0% / NA	No	Evaluated	Full
11380003	6	Temperature	24 / 2	27.2	13.6	13.7	0 / 0	0% / 0%	No	Evaluated	Full

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	47c BMIBI BIT	BMIBI Pass/ Fail
259	8/14/01	22	47c	MS/WW	ArtSub	35	Fair	52	Fail

Fish:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage/ Thermal	Riffle Stream?	FIBI score	FIBI Class	47c FIBI BIT	FIBI Pass/ Fail
259	8/14/01	22	47c	MS/WW	No	64	Good	44	Pass

Overall:

Community	Assessment Type	Assessment Result	Support Level	Earned IR Category	Actual IR Category	Reason
Benthic Macroinvertebrates	Evaluated	Fail (0/1)	Partial
Fish	Evaluated	Pass (1/1)	Full
Overall	Evaluated	Fail	Partial	3bu	4a	Assessment was evaluated because it was based on an old single sample.

Monitoring and Methods

Assessment Key Dates

3/6/2001

Non-fixed Monitoring Start Date

8/14/2001

Biological Monitoring

10/13/2003

Non-fixed Monitoring End Date

10/1/2007

TMDL Completed

Methods

150

Monitoring data more than 5 years old

220

Non-fixed station physical/chemical monitoring (conventional pollutant only)

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

330

Fish surveys