Dousman Creek IA 01-YEL-438
mouth (S33 T96N R3W Allamakee Co.) to Allamakee-Clayton county line.
- Assessment Cycle
- 2024
- Release Status
- Pending
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:40 AM
- Updated
- 2/2/2024 7:01:38 AM
Assessment Summary
The presumptive Class A1 use was assessed as “not supported” due to levels of indicator bacteria that exceeded state water quality criteria. The Class BCW1 use was assessed as "not supported" based on levels of dissolved oxygen that violated state water quality criteria. All other designated uses were "not assessed." Note: A TMDL for the bacterial impairment for Yellow River basin streams was prepared by DNR in 2012 and was approved by U.S. EPA in February 2013. Due to TMDL completion, the Integrated Report category for the Class A1 recreational use was changed from 5p to 4a.
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 352 Dousman Creek Ion Iowa DNR 6 WQ CY 2004-2006, CY 2006-2008 15030004 Dousman Creek YRWP Site ID Data Source ID # Samples / # Years 2006 Geometric Mean 2007 Geometric Mean 2008 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 15030004 6 34 / 3 246 148 322 Yes 15 44% Yes Evaluated Not Site ID Data Source ID Parameter Name # Samples / # Years # Acute / Chronic Violations % Acute/ Chronic Violations Significantly >10% Violations Assessment Type Support Level 15030004 6 Dissolved oxygen 75 / 3 20 / 0 27% / 0% Yes Evaluated Not Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/ Fail 352 8/7/19 7.4 52b MS Hess 50 NA 60 Fail 352 8/12/15 7.4 52b MS Hess 66 NA 60 Pass 352 7/18/03 7.4 52b MS Hess 60 NA 60 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (2/3) Full Assessment was evaluated because some of the
samples used Overall Evaluated Pass Full 1 to complete the assessment were greater than
five years old.
Presumptive Class A1 – Indicator Bacteria: 2006-2008
Class A2 – No Data
Class BCW1 – Dissolved Oxygen: 2004-2006
Class BCW1 - Biological Sampling:
Benthic Macroinvertebrates:
Overall:
Class BCW1 - Trout Natural Reproduction:
Based on the January 2024 trout reproduction in Iowa streams summary prepared
by the DNR Fisheries Bureau, the Class BCW1 coldwater aquatic life use of
Dousman Creek was assessed as "fully supported". According to the
updated summary, this stream was placed in Category II: streams that exhibit recent
but inconsistent reproductive success and occasional stocking may be needed to
maintain the trout population.
Class HH – No Data
Assessment Key Dates
| 1/1/2024 | Biological Monitoring |
| 5/20/2004 | Monitoring Start |
| 11/16/2006 | Monitoring End |
| 2/1/2006 | Monitoring Start |
| 9/30/2008 | Monitoring End |
| 8/12/2015 | Biological Monitoring |
| 2/25/2013 | TMDL Completed |
| 8/7/2019 | Biological Monitoring |
| 7/18/2003 | Biological Monitoring |
Methods
| 120 | Surveys of fish and game biologists/other professionals |
| 150 | Monitoring data more than 5 years old |
| 200 | Physical/Chemical Monitoring |
| 315 | Regional reference site approach |
| 320 | Benthic macroinvertebrate surveys |
| 330 | Fish surveys |
| 420 | Indicator bacteria monitoring |