Dousman Creek IA 01-YEL-438
mouth (S33 T96N R3W Allamakee Co.) to Allamakee-Clayton county line.
- Assessment Cycle
- 2022
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/16/2021 9:21:54 AM
- Updated
- 12/16/2021 9:50:43 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 Class A2 – Indicator Bacteria: 2006-2008 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 No 6 17% No Evaluated Full 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 15030004 6 Dissolved
oxygen 75
/ 3 NA NA NA 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 Overall: 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
to complete Overall Evaluated Pass Full 1 the assessment were greater than five years old. Based on the January 2021 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 I: streams that exhibit consistent natural reproduction and
maintain a wild population of one or more trout species without any stocking.
Presumptive Class A1 – Indicator Bacteria: 2006-2008
Class BCW1 – Dissolved Oxygen: 2004-2006
Class BCW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class BCW1 - Trout Natural Reproduction:
Class HH – No Data
Assessment Key Dates
1/1/2021 | Biological Monitoring |
5/20/2004 | Non-fixed Monitoring Start Date |
11/16/2006 | Non-fixed Monitoring End Date |
2/1/2006 | Non-fixed Monitoring Start Date |
9/30/2008 | Non-fixed Monitoring End Date |
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 |
220 | Non-fixed station physical/chemical monitoring (conventional pollutant only) |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
330 | Fish surveys |
380 | Quantitative physical habitat assessment |
420 | Indicator bacteria monitoring |