Mississippi River IA 01-NEM-61
from Iowa R. (Louisa Co.) to Lock & Dam 15 at Davenport Scott Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:13:12 AM
- Updated
- 2/2/2024 10:22:41 AM
| Cycle Added | Class | Cause | Data Source | Rationale |
|---|---|---|---|---|
| 2018 | Class BWW1 | Metals: Aluminum | Ambient monitoring: adjacent state | New data: WQ improvement (chemical / physical / bacterial) |
The Class A1 use was assessed as "not supported" due to high levels of indicator bacteria (fecal coliforms) reported by the Illinois EPA. The Class BWW1 use was assessed as "WINOFI" due to a fish kill attributed to natural causes. The Class HH use was assessed as "fully supported" based on the results of fish tissue and water quality monitoring data. The results of interstate consultation via the UMRBA Water Quality Task Force were also used to develop this assessment. The water quality monitoring data collected at the IEPA site L-04 were also used to assess segment IA 02-ICM-619.
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site
Name Site
Description IEPA 10 WQ CY 2020-2022 99990020 Mississippi
River IEPA Site L-04 Iowa DNR 6 FT See Below 1130 Mississippi
River downstream
of Muscatine Iowa DNR 6 FT See Below 1168 Mississippi
River at
Linwood Iowa DNR 6 FT See Below 1359 Mississippi
River Pool 16 Montpelier Class A1 – pH: Site ID Data Source ID # Samples / # Years Minimum Value Maximum Value Mean Value # Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 99990020 10 11 / 3 7.4 8.3 8 0 3 NO Mon Full Site ID Data Source ID Parameter Name # Samples / # Years Minimum Value Maximum Value Mean Value # Violations # Acute / Chronic Violations Violations needed for impairment Violates Significantly >10% Rule? Assessment Type Support Level 99990020 10 Chloride 12 / 3 21.6 41.4 28.6 NA 0 / 0 4 NO Mon Full 99990020 10 Dissolved Oxygen 11 / 3 7.4 14.6 11.5 0 NA / NA 3 NO Mon Full 99990020 10 pH 11 / 3 7.4 8.3 8 0 NA / NA 3 NO Mon Full 99990020 10 Sulfate 12 / 3 15.4 33.3 24.7 0 NA / NA 4 NO Mon Full 99990020 10 Temperature 11 / 3 1.8 25.3 11.9 0 NA / NA 3 NO Mon Full Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations >1 Acute / Chronic Violation Assessment Type Support Level 99990020 10 Aluminum 12 / 3 1000 372.5 353 0 / 1 NO Mon Full 99990020 10 Ammonia 11 / 3 0.14 0.07 0.05 0 / 0 NO Mon Full 99990020 10 Arsenic 12 / 3 1.31 0.87 0.94 0 / 0 NO Mon Full 99990020 10 Cadmium 12 / 3 1.5 1.5 1.5 0 / 0 NO Mon Full 99990020 10 Chromium 12 / 3 2.5 1.9 2.5 0 / 0 NO Mon Full 99990020 10 Copper 12 / 3 4.69 2.71 2.5 0 / 0 NO Mon Full 99990020 10 Cyanide 12 / 3 1 0.95 1 0 / 0 NO Mon Full 99990020 10 Lead 12 / 3 2.5 2.5 2.5 0 / 0 NO Mon Full 99990020 10 Nickel 12 / 3 2.5 1.7 1.7 0 / 0 NO Mon Full 99990020 10 Selenium 12 / 3 3.5 2.6 2.5 0 / 0 NO Mon Full 99990020 10 Silver 12 / 3 1.5 1.5 1.5 0 / 0 NO Mon Full 99990020 10 Zinc 12 / 3 5 3.3 2.5 0 / 0 NO Mon Full Site ID Data Source ID Parameter Name # Samples per Year (2020/ 2021/2022) 2020 Mean 2021 Mean 2022 Mean # Non-Detects per Year (2020/2021/2022) Support Level per Year (2020/2021/2022) Assessment Type Support Level 99990020 10 Arsenic 4/4/4 1.635 1.168 1.015 0/0/2 Full/Full/Full Mon Full 99990020 10 Cadmium 4/4/4 1.698 0 0 3/4/4 Full/Full/Full Mon Full 99990020 10 Chromium 4/4/4 2.325 1.485 1.768 2/1/2 Full/Full/Full Mon Full 99990020 10 Chromium 4/4/4 2.325 1.485 1.768 2/1/2 Full/Full/Full Mon Full 99990020 10 Copper 4/4/4 2.57 0 3.048 1/4/3 Full/Full/Full Mon Full 99990020 10 Cyanide 4/4/4 0 0.84 0 4/3/4 Full/Full/Full Mon Full 99990020 10 Nickel 4/4/4 1.928 3.895 2.518 0/2/3 Full/Full/Full Mon Full 99990020 10 Selenium 4/4/4 2.758 0 0 3/4/4 Full/Full/Full Mon Full 99990020 10 Zinc 4/4/4 6.432 6.425 9.132 2/3/2 Full/Full/Full Mon Full Site ID Biopart Year Species # in sample / # of samples Avg Length (cm) (Avg) Hg (ppm) Chlordane (ppm) Sum PCBs (ppm) 1168 whole 2016 common carp 3 43.1 0.05 0.06 0.06 1168 fillet 2018 channel catfish 3 42.7 0.03 0.06 1168 fillet 2018 common carp 3 57.2 0.02 0.08 1130 fillet 2018 channel catfish 3 44.1 0.02 0.07 1130 fillet 2018 common carp 3 64.9 0.02 0.07 1130 fillet 2018 common carp 1 50.4 0.02 0.15 1359 tissue plug 2019 walleye 2 50.3 0.179 1359 tissue plug 2020 bluegill 20 18.6 0.093 1359 tissue plug 2020 crappie spp. 20 29.8 0.132 1359 tissue plug 2020 flathead catfish 3 40.3 0.169 1359 tissue plug 2020 freshwater drum 20 43.3 0.219 1359 tissue plug 2019 largemouth bass 20 32.6 0.176 1359 tissue plug 2020 northern pike 13 63.9 0.14 1359 tissue plug 2020 walleye 14 47.9 0.207 1359 tissue plug 2020 white bass 20 28.9 0.14 1359 tissue plug 2021 northern pike 7 59.2 0.118 1359 tissue plug 2021 flathead catfish 7 52.8 0.142 Support Level Full
Class A1 - Indicator Bacteria: No Data
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 - Fish kill Assessment:
The Class BWW1 use assessment based on the 2015 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 (WINOFI). If no additional fish kills are reported in the
segment for a 10-year period (2025), the Category will be changed from 3b to 3a
(not assessed).
Details about the 2015 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/918
Class HH-F - Toxic Parameters:
Class HH - Fish Tissue Sampling: