Upper Iowa River IA 01-UIA-237
from Lane's Bridge (NW 1/4 S31 T100N R4W Allamakee Co.) to confluence with Canoe Cr. in S25 T99N R7W Winneshiek Co.
- Assessment Cycle
- 2020
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 8/21/2020 2:43:04 PM
- Updated
- 12/6/2021 8:15:27 AM
Assessment Summary
The Class A1 use was assessed as “partially supported” due to levels of indicator bacteria (E. coli) that exceeded state water quality criteria. The Class BWW1 use was assessed as "fully supported" based on biological sampling data and water quality monitoring data. The Class HH use remains assessed as “partially supported” based on 2010 fish tissue sampling data and on the continuance of a fish consumption advisory for this segment of the Upper Iowa River.
Assessment Explanation
Sources of Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2016-2018 10030001 Upper Iowa River near Dorchester Iowa DNR 6 BIO See Below 288 Upper Iowa River Dorchester Iowa DNR 6 FT See Below 113 Upper Iowa River SE of Dorchester Class A1 - Indicator
Bacteria: Site ID Data Source ID # Samples / # Years 2016 Geometric Mean 2017 Geometric Mean 2018 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10030001 6 20 / 3 125.38 132.36 322.01 Yes 9 45% Yes Monitored Partial 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 10030001 6 36 / 3 8.5 8.2 8.2 0 0% No Monitored 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 10030001 6 Ammonia 36 / 3 0.43 0.04 0.02 0 / 0 0% / 0% No Monitored Full 10030001 6 Chloride 36 / 3 20 15.8 16 0 / 0 0% / 0% No Monitored Full 10030001 6 Dissolved oxygen 36 / 3 14.3 11 11 NA / 0 NA / 0% No Monitored Full 10030001 6 pH 36 / 3 8.5 8.2 8.2 0 / NA 0% / NA No Monitored Full 10030001 6 Sulfate 36 / 3 22 16 16 0 / NA 0% / NA No Monitored Full 10030001 6 Temperature 36 / 3 24.3 11.2 11.5 0 / 0 0% / 0% No Monitored Full Class BWW1 - Toxic
Parameters: Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations % Acute/ Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 10030001 6 Aluminum 9 / 2 8.3 1.483 0.26 0 / 0 0% / 0% No Evaluated Full 10030001 6 Arsenic 9 / 2 0.97 0.62 0.68 0 / 0 0% / 0% No Evaluated Full 10030001 6 Cadmium 9 / 2 0.025 0.025 0.025 0 / 0 0% / 0% No Evaluated Full 10030001 6 Chromium 9 / 2 1.3 1.04 1 0 / 0 0% / 0% No Evaluated Full 10030001 6 Copper 9 / 2 1.4 0.72 0.54 0 / 0 0% / 0% No Evaluated Full 10030001 6 Lead 9 / 2 0.33 0.091 0.07 0 / 0 0% / 0% No Evaluated Full 10030001 6 Nickel 9 / 2 2.6 2 1.9 0 / 0 0% / 0% No Evaluated Full 10030001 6 Selenium 9 / 2 1.5 0.9 0.84 0 / 0 0% / 0% No Evaluated Full 10030001 6 Zinc 9 / 2 4.2 1.71 1.4 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 52b BMIBI BIT BMIBI Pass/ Fail 288 8/16/16 768 52b MS/WW Hess 84 Excellent 61 Pass 288 8/16/16 768 52b MS/WW Float ArtSub 78 Excellent 61 Pass 288 10/8/14 768 52b MS/WW Hess 70 Good 61 Pass 288 10/8/14 768 52b MS/WW Float ArtSub 81 Excellent 61 Pass Overall Assessment: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Monitored Pass (4/4) Full 1 Assessment is
monitored because two or more samples collected in last five years were used
to complete the assessment. Class HH – Fish Tissue
Sampling: Site ID Date Species Name Biopart # in sample Hg result Hg violation (>0.3)? Assessment Type Support Level 113 8/26/2010 golden redhorse fillet 5 0.318 Yes Evaluated Partial 113 8/26/2010 smallmouth bass fillet 5 0.392 Yes Evaluated Partial A one meal/week consumption advisory for mercury exists on this
Segment of the Upper Iowa River – seeIowa
Consumption Advisories Class HH-F - Toxic
Parameters: 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 10030001 6 Cadmium 9 / 2 0.025 0.025 0.025 9 No All Non-Detect Full 10030001 6 Chromium 9 / 2 1.3 1.04 1 0 No Evaluated Full 10030001 6 Copper 9 / 2 1.4 0.72 0.54 0 No Evaluated Full 10030001 6 Nickel 9 / 2 2.6 2 1.9 0 No Evaluated Full 10030001 6 Selenium 9 / 2 1.5 0.9 0.84 1 No Evaluated Full 10030001 6 Zinc 9 / 2 4.2 1.71 1.4 0 No Evaluated Full
Assessment Key Dates
8/26/2010 | Fish Tissue Monitoring |
1/11/2016 | Fixed Monitoring Start Date |
12/5/2018 | Fixed Monitoring End Date |
10/8/2014 | Biological Monitoring |
8/16/2016 | Biological Monitoring |
Methods
150 | Monitoring data more than 5 years old |
230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
260 | Fish tissue analysis |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
330 | Fish surveys |
420 | Indicator bacteria monitoring |