North Raccoon River IA 04-RAC-1139
from County Road M54 (S24T88N R36W Sac Co.) to confluence with Drainage Ditch 101 in S36 T91N R36W Buena Vista Co.
- Cycle
- 2022
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/10/2021 2:12:47 PM
- Updated
- 1/13/2022 6:22:50 AM
The presumptive Class A1 use was assessed as "not supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "not supported” based on biological sampling data. All other designated uses were "not assessed." Note: A TMDL for pathogen indicator impairments in the Raccoon River basin was approved by EPA in 2008. Because this TMDL covers bacterial impairments, this impairment was moved from IR Category 5a from the 2008 assessment/listing cycle to IR Category 4a (impaired; TMDL approved) for the 2010 cycle and remains there for this cycle.
Data Sources: Data
Source Data
Source ID Data
Type Data
Age Site
ID Site
Name Site
Description Iowa
DNR 6 WQ CY
2012-2014 10810002 North
Raccoon River US of Sac City (US1) Iowa
DNR 6 BIO See
Below 143 North
Raccoon River Raccoon River Greenbelt – Sac City Iowa
DNR 6 BIO See
Below 1157 North
Raccoon River Sac City – REMAP #443 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 10810002 6 22 / 3 70 148 274 Yes 9 41% Yes Evaluated Not Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10810002 6 33 / 3 9 8.26 8.3 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 10810002 6 Ammonia 33 / 3 1.7 0.18 0.05 0 / 0 0% / 0% No Evaluated Full 10810002 6 Chloride 33 / 3 140 63 63 0 / 0 0% / 0% No Evaluated Full 10810002 6 Dissolved oxygen 33 / 3 17.3 10.7 10.2 NA / 0 NA / 0% No Evaluated Full 10810002 6 pH 33 / 3 9 8.26 8.3 0 / NA 0% / NA No Evaluated Full 10810002 6 Sulfate 33 / 3 410 173 170 0 / NA 0% / NA No Evaluated Full 10810002 6 Temperature 33 / 3 29.5 11.3 9.8 0 / 0 0% / 0% No Evaluated Full Site
ID Date Drainage
Area (mi2) Ecoregion Major
Drainage BM
Sample Gear BMIBI
score BMIBI
Class 47b
BMIBI BIT BMIBI
Pass/Fail 143 9/24/19 328 47b MS Hess 65 Good 62 Pass 1157 9/18/17 330 47b MS Hess 54 Fair 62 Fail 143 8/13/15 328 47b MS Hess 62 Good 62 Pass Fish: Site
ID Date Drainage
Area (mi2) Ecoregion Major
Drainage Riffle
Stream? FIBI
score FIBI
Class 47b
FIBI BIT FIBI
Pass/Fail 143 9/24/19 328 47b MS Yes 62 Good 53 Pass 1157 9/18/17 330 47b MS No 72 Excellent 32 Pass Overall: Community Assessment
Type Assessment
Result Support
Level IR
Category Reason Benthic Macroinvertebrates Evaluated Pass
(2/3) Full Fish Evaluated Pass
(2/2) Full 5bt Assessment was evaluated because one of the samples used
to complete Overall Evaluated Pass Full the assessment was greater than five years old.
Presumptive Class A1 – Indicator Bacteria:
Presumptive Class A1 - pH:
Class BWW1 - Conventional Parameters:
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Class HH – No Data