Trinkle Creek IA 06-BOY-6351

from mouth in NE14 Sec 14 T85N R38W Crawford Co. to headwaters in S23 T85N R37W Crawford 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: 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
Trend: Unknown
Created: 11/1/2023 8:13:33 AM
Updated: 1/4/2024 10:13:20 AM

Use Support

Class A1

Presumptive Use

Recreation - Primary contact

Not Assessed

Class BWW1

Presumptive Use

Aquatic Life - Warm Water Type 1

Fully Supported

Impairment Delistings

No delistings for this assessment cycle.

Documentation

Assessment Summary

The presumptive Class BWW1 use was assessed as “fully supported” based on biological sampling data. All other designated uses were "not assessed."

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	743	Trinkle Creek	Kiron – HW115

Presumptive Class A1 - No Data

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	47e BMIBI BIT	BMIBI Pass/Fail
743	9/15/16	10.9	47e	MO/WW	Surber	69	Good	54	Pass
743	9/15/16	10.9	47e	MO/WW	ArtSub	59	Good	54	Pass
743	7/27/16	10.9	47e	MO/WW	Surber	72	Good	54	Pass
743	10/5/15	10.9	47e	MO/WW	Surber	62	Good	54	Pass
743	10/5/15	10.9	47e	MO/WW	LowFlow ArtSub	56	Good	54	Pass
743	8/3/15	10.9	47e	MO/WW	Surber	59	Good	54	Pass
743	8/3/15	10.9	47e	MO/WW	ArtSub	52	Fair	54	Fail

Fish:

BioNet Site ID	Date	Drainage Area (mi2)	Ecoregion	Major Drainage/ Thermal	Riffle Stream?	FIBI score	FIBI Class	47e FIBI BIT	FIBI Pass/ Fail
743	9/15/16	10.9	47e	MO/WW	NA	39	Fair	31	Pass
743	7/27/16	10.9	47e	MO/WW	NA	19	Poor	31	Fail
743	10/5/15	10.9	47e	MO/WW	NA	33	Fair	31	Pass
743	8/3/15	10.9	47e	MO/WW	NA	53	Good	31	Pass

Overall:

Community	Assessment Type	Assessment Result	Support Level	IR Category	Reason
Benthic Macroinvertebrates	Evaluated	Pass (6/7)	Full
Fish	Evaluated	Pass (3/4)	Full		Assessment was evaluated because the drainage area
Overall	Evaluated	Pass	Full	1	of the sample site was smaller than the calibrated range.

Monitoring and Methods

Assessment Key Dates

8/3/2015

Biological Monitoring

10/5/2015

Biological Monitoring

7/27/2016

Biological Monitoring

9/15/2016

Biological Monitoring

Methods

150

Monitoring data more than 5 years old

315

Regional reference site approach

320

Benthic macroinvertebrate surveys

330

Fish surveys