Unnamed Creek (near Hazleton) IA 01-WPS-394

mouth (NE 1/4 SW 1/4 S28 T90N R9W Buchanan Co.) to headwaters in S26 T90N R9W Buchanan 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: 5 - Water is impaired or threatened and a TMDL is needed.
Trend: Unknown
Created: 11/1/2023 8:13:56 AM
Updated: 12/11/2023 10:49:41 AM

Use Support

Class A1

Presumptive Use

Recreation - Primary contact

Not Assessed

Class BWW1

Presumptive Use

Aquatic Life - Warm Water Type 1

Not Supported

Fish Kill: Caused By Animal Waste

Support Level

Not Supported

Impairment Code

5b - Biological impairment or pollutant-caused fish kill - unknown source. No administrative action.

Cause Magnitude

Moderate

Status

Continuing

Source

Unknown: Source Unknown

Source Confidence

N/A

Cycle Added

2010

Impairment Rationale

Pollutant-caused fish kill

Data Source

Fish kill investigation: Iowa DNR

TMDL Priority

Tier IV

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The Presumptive Class BWW1 use remains assessed as "not supported" due to multiple fish kill investigations. All other designated uses were "not assessed."

Assessment Explanation

Presumptive Class A1 - No Data

Presumptive Class BWW1 - Fish kill Assessment:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage/ Thermal	Fish per mile	47c REMAP 25 % fish per mile	> 47c REMAP 25 % fish per mile?	2024 IR 47c expected fish taxa	Fish Taxa Present % (>50% to pass)
966	9/21/2022	1.4	47c	MS/WW	792	2992	No(Fail)	5/12	42% (Fail)
The Presumptive Class BWW1 remains in Category 5b based on 2000 and 2009 fish kills. This segment’s fish community was sampled in 2022 as part of the DNR fish kill follow-up sampling program. The results from this follow-up sampling and ecoregion average comparison show that the fish community in this segment are not at levels expected for this non-fish kill impacted streams in this ecoregion. Based on the fish kill follow-up sampling results, the Category for the fish kill assessment remains 5b.

Details about the 2009 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/800

Details about the 2000 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/459

Monitoring and Methods

Assessment Key Dates

8/18/2000

Fish Kill

8/7/2009

Fish Kill

7/9/2013

Biological Monitoring

9/21/2022

Biological Monitoring

Methods

140

Incidence of spills and/or fish kills

330

Fish surveys