Little Sioux River IA 06-LSR-1573
from confluence with Willow Cr. (S17 T94N R36W Clay Co.) to east corporate limit of Spencer at west line of S17 T96N R36W Clay Co.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 9/21/2020 3:06:26 PM
- Updated
- 10/19/2020 7:36:18 AM
The Class A1 use remains assessed as "not supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use remains assessed as "partially supported" based on biological sampling data. The Class HH use remains assessed as "fully supported" based on fish tissue sampling.
Sources of Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2012-2014 10210003 Little Sioux River DS of Spencer (DS1) Iowa DNR 6 BIO See Below 924 Little Sioux River Spencer – DS1 Iowa DNR 6 BIO See Below 481 Little Sioux River Spencer – REMAP #129 Iowa DNR 6 FT See Below 183 Little Sioux River At Gillet Grove Class
A1 - Indicator Bacteria: 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 10210003 6 22 / 3 1181 1805 895 Yes 19 86% Yes Evaluated Not 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 10210003 6 32 / 3 8.7 8.13 8.2 0 0% No Evaluated Full Class
BWW1 - Conventional Parameters: 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 10210003 6 Ammonia 32 / 3 1.3 0.15 0.05 0 / 0 0% / 0% No Evaluated Full 10210003 6 Chloride 33 / 3 57 33.3 32 0 / 0 0% / 0% No Evaluated Full 10210003 6 Dissolved oxygen 33 / 3 16.5 11.1 10.6 NA / 0 NA / 0% No Evaluated Full 10210003 6 pH 32 / 3 8.7 8.13 8.2 0 / NA 0% / NA No Evaluated Full 10210003 6 Sulfate 33 / 3 180 101 100 0 / NA 0% / NA No Evaluated Full 10210003 6 Temperature 33 / 3 27.3 11.7 11.6 0 / 0 0% / 0% No Evaluated Full Class
BWW1 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal BM Sample Gear BMIBI score BMIBI Class 47a BMIBI BIT BMIBI Pass/ Fail 924 9/8/14 1104 47a MO/WW ArtSub 38 Fair 54 Fail 924 10/8/13 1104 47a MO/WW ArtSub 44 Fair 54 Fail Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal Riffle Stream? FIBI score FIBI Class 47a FIBI BIT FIBI Pass/ Fail 481 9/6/05 1109 47a MO/WW NA 33 Fair 43 Fail Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/2) Partial Fish Evaluated Fail (0/1) Partial Overall Evaluated Fail Partial 3bu 3bu Assessment
is evaluated because the drainage areas of the sample sites were larger than
the calibrated range. Class
HH – Fish Tissue Sampling: Site ID Date Species Name Biopart # in sample chlordane result chlordane violation
(>0.6)? PCBs result PCBs violation
(>0.2)? Hg result Hg violation
(>0.3)? Assessment Type Support Level 183 10/2/2015 walleye plug 5
0.174 No Monitored Full 183 9/22/2011 largemouth bass plug 5
0.289 No Evaluated Full 183 9/14/2011 channel catfish fillet 3 <0.03 No <0.09 No 0.115 No Evaluated Full