Des Moines River IA 04-LDM-1011
from Ottumwa dam (S24 T72N R14W Wapello Co.) to confluence with Cedar Cr in S33 T75N R17W Mahaska Co.
- Assessment Cycle
- 2022
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trend
- Unknown
- Created
- 12/27/2021 1:25:59 PM
- Updated
- 1/13/2022 12:47:51 PM
The Class A1 use was assessed as “fully supported” based on water quality monitoring data. The Class BWW1 use was assessed as "WINOFI” based on biological sampling data and based on the results of a fish kill investigation. The Class C use was assessed as "fully supported" based on water quality monitoring data. All other designated uses were "not assessed."
Data
Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2012-2014 10900003 Des Moines River US of Ottumwa at Co Rd T67 Bridge at
Chillicothe Iowa DNR 6 BIO See Below 955 Des Moines River – Ottumwa - US Iowa DNR 6 BIO See Below 1156 Des Moines River – Chillicothe REMAP #454 Site ID Data Source ID # Samples / # Years 2012 Geometric Mean 2013 Geometric Mean 2014 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10900002 6 22 / 3 86 40 100 No 3 14% No Evaluated Full Class
A1 - pH: Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10900002 6 33 / 3 8.7 8.2 8.2 0 0% 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 10900002 6 Ammonia 33 / 3 0.45 0.1 0.05 0 / 0 0% / 0% No Evaluated Full 10900002 6 Chloride 33 / 3 91 49 43 0 / 0 0% / 0% No Evaluated Full 10900002 6 Dissolved oxygen 33 / 3 17 10.6 10.1 NA / 0 NA / 0% No Evaluated Full 10900002 6 pH 33 / 3 8.7 8.2 8.2 0 / NA 0% / NA No Evaluated Full 10900002 6 Sulfate 33 / 3 130 78 82 0 / NA 0% / NA No Evaluated Full 10900002 6 Temperature 33 / 3 29.1 12.8 11.8 0 / 0 0% / 0% No Evaluated Full Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class BMIBI BIT BMIBI Pass/ Fail 1156 8/22/17 13200 40a MS/WW Float ArtSub 64 Good 41 Pass BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 40a FIBI BIT FIBI Pass/ Fail 1156 8/22/17 13200 40a MS/WW NA 32 Fair 33 Pass Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (1/2) Not Fish Evaluated Pass (1/1) Full FIBI passed with 7 point FIBI UAV applied to single
samples. Overall Evaluated Fail Not 3bu Assessment was evaluated because the drainage areas of
the sample sites were larger than the calibrated range. The
Class BWW1 use assessment based on the 2017 fish kill placed this segment in
Category 3b. Because the cause of the fish kill was not identified, or the fish
kill was attributed to a non-pollutant cause (e.g., winterkill), the assessment
type is “evaluated.” Segments assessed using “evaluated” assessments are placed
in Category 3b and are added to the state list of waters in need of further
investigation. If no additional fish kills are reported in the segment for a 10
year period (2027), the Category will be changed from 3b to 3a (water not
assessed). Details
about the 2016 fish kill can be found here:https://programs.iowadnr.gov/fishkill/Events/944 Class
C - Conventional Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10620001 6 Chloride 33 / 3 91 49 43 0 0% No Evaluated Full 10620001 6 Inorganic nitrogen (nitrate and nitrite) 33 / 3 14 4 3.4 2 6% No Evaluated Full Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value Number of Non - Detects Mean Value > Criterion or MCL Assessment Type Support Level 10620001 6 Alachlor 32 / 3 0.1 0.04 0.025 NA No Evaluated Full 10620001 6 Atrazine 26 / 3 2 0.43 0.2 NA No Evaluated Full 10620001 6 Carbofuran 26 / 3 0.1 0.1 0.1 NA No Evaluated Full 10620001 6 Cyanazine 26 / 3 0.1 0.1 0.1 NA No Evaluated Full
Class HH - No Data
Class A1 - Indicator Bacteria:
Class BWW1 - Conventional Parameters:
Class BWW1 - Biological Sampling:
Fish:
Overall:
Class BWW1 – Fishkill Assessment:
Class C - Toxic Parameters: