Chariton River IA 05-CHA-1308
from the Highway 2 crossing (S27 T69N R17W Appanoose Co.) to Rathbun Dam in S35 T69N R18W Appanoose 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
- Stable
- Created
- 6/12/2020 8:02:35 AM
- Updated
- 10/15/2020 11:39:43 AM
Assessment Summary
The Class A1 use was assessed as "partially supported" based on levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "partially supported" due to a fish kill investigation. The Class C use was assessed as "fully supported" based on water quality monitoring data. The Class HH use was assessed as "fully supported" based on fish tissue sampling and water quality monitoring data.
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 10040002 Chariton River at 461st St. USACE 12 WQ CY 2016-2018 99990007 Rathbun Reservoir Outlet (Site RA-28) Iowa DNR 6 BIO See Below 914 Chariton River Rathbun - at 461st St. Bridge Iowa DNR 6 FT See Below 148 Chariton River N of Centerville 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 10040002 6 21 / 3 173.48 31.85 67.19 Yes 4 19% Yes Monitored Partial Class
A - pH: Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10040002 6 36 / 3 8.1 7.7 7.7 0 0% No Monitored Full 99990007 12 5 / 2 7.83 7.7 7.73 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 10040002 6 Ammonia 36 / 3 0.37 0.07 0.02 0 / 0 0% / 0% No Monitored Full 10040002 6 Chloride 36 / 3 33 9.3 8.8 0 / 0 0% / 0% No Monitored Full 10040002 6 Dissolved oxygen 36 / 3 15 9.6 9.8 NA / 0 NA / 0% No Monitored Full 10040002 6 pH 36 / 3 8.1 7.7 7.7 0 / NA 0% / NA No Monitored Full 99990007 12 pH 5 / 2 7.83 7.7 7.73 0 / NA 0% / NA No Evaluated Full 10040002 6 Sulfate 36 / 3 22 19 20 0 / NA 0% / NA No Monitored Full 10040002 6 Temperature 36 / 3 26.5 13 12.7 0 / 0 0% / 0% No Monitored Full 99990007 12 Temperature 17 / 3 26.8 20.6 20.3 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 10040002 6 Aluminum 9 / 2 1.3 0.6 0.5 0 / 0 0% / 0% No Evaluated Full 10040002 6 Arsenic 9 / 2 2.6 1.8 1.9 0 / 0 0% / 0% No Evaluated Full 10040002 6 Cadmium 9 / 2 0.025 0.025 0.025 0 / 0 0% / 0% No Evaluated Full 10040002 6 Chromium 9 / 2 0.63 0.46 0.43 0 / 0 0% / 0% No Evaluated Full 10040002 6 Copper 9 / 2 1.3 1.08 1.2 0 / 0 0% / 0% No Evaluated Full 10040002 6 Lead 9 / 2 0.09 0.047 0.025 0 / 0 0% / 0% No Evaluated Full 99990007 12 Lead 1 / 1 1730 1730 1730 1 / 1 100% / 100% NA Evaluated NA 99990007 12 Mercury 1 / 1 9.7 9.7 9.7 1 / 1 100% / 100% NA Evaluated NA 10040002 6 Nickel 9 / 2 2.6 2.1 2 0 / 0 0% / 0% No Evaluated Full 10040002 6 Selenium 9 / 2 1.5 0.53 0.52 0 / 0 0% / 0% No Evaluated Full 99990007 12 Selenium 1 / 1 0.4 0.4 0.4 0 / 0 0% / 0% No Evaluated Full 10040002 6 Zinc 9 / 2 3.1 0.87 0.49 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 40a BMIBI BIT BMIBI Pass/ Fail 914 7/20/18 550 40a MO/WW Hess 63 Good 41 Pass 914 8/1/16 550 40a MO/WW Hess 53 Fair 41 Pass Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic Macroinvertebrates Evaluated Pass (2/2) Full 1 1 Assessment is evaluated because the drainage area of the sample site
was larger than the calibrated range. Class BWW1 – Fish kill Assessment: The
Class BWW1 use assessment based on the 2018 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 (2028), the Category will be changed from 3b to 3a (water not
assessed). Details
about the 2018 fish kill can be found here: https://programs.iowadnr.gov/fishkill/Events/952 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 10040002 6 Chloride 36 / 3 33 9.3 8.8 0 0% No Monitored Full 10040002 6 Inorganic nitrogen (nitrate and nitrite) 36 / 3 0.92 0.32 0.19 0 0% No Monitored Full Class
C - 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 10040002 6 Alachlor 3 / 1 0.05 0.05 0.05 3 No Evaluated Full 99990007 12 Alachlor 1 / 1 0.01 0.01 0.01 1 No Evaluated Full 10040002 6 Atrazine 3 / 1 0.6 0.5 0.5 0 No Evaluated Full 99990007 12 Atrazine 9 / 3 0.96 0.5 0.52 0 No Evaluated Full 10040002 6 Cadmium 9 / 2 0.025 0.025 0.025 9 No Evaluated Full 10040002 6 Chromium 9 / 2 0.63 0.46 0.43 0 No Evaluated Full 99990007 12 Glyphosate 1 / 1 0.1 0.1 0.1 1 No Evaluated Full 10040002 6 Lead 9 / 2 0.09 0.047 0.025 5 No Evaluated Full 99990007 12 Lead 1 / 1 1730 1730 1730 0 NA Evaluated NA 10040002 6 Silver 9 / 2 0.025 0.025 0.025 9 No Evaluated Full 10040002 6 Simazine 3 / 1 0.05 0.05 0.05 3 No Evaluated Full Class
HH-FW - 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 10040002 6 Copper 9 / 2 1.3 1.08 1.2 0 No Evaluated Full 99990007 12 Copper 1 / 1 4 4 4 1 No Evaluated Full 99990007 12 Mercury 1 / 1 9.7 9.7 9.7 0 NA Evaluated NA 10040002 6 Nickel 9 / 2 2.6 2.1 2 0 No Evaluated Full 10040002 6 Selenium 9 / 2 1.5 0.53 0.52 4 No Evaluated Full 99990007 12 Selenium 1 / 1 0.4 0.4 0.4 1 No Evaluated Full 10040002 6 Zinc 9 / 2 3.1 0.87 0.49 0 No Evaluated Full Class
HH – Fish Tissue Sampling: Site ID Date Species Name Biopart # in sample Hg result Hg violation (>0.3)? Assessment Type Support Level 148 7/31/2013 white crappie plug 5 0.195 No Evaluated Full 148 8/19/2011 white crappie plug 5 0.316 Yes Evaluated Partial
Assessment Key Dates
| 1/11/2016 | Fixed Monitoring Start Date |
| 12/4/2018 | Fixed Monitoring End Date |
| 7/31/2013 | Fish Tissue Monitoring |
| 8/19/2011 | Fish Tissue Monitoring |
| 8/1/2016 | Biological Monitoring |
| 3/4/2018 | Fish Kill |
| 7/20/2018 | Biological Monitoring |
Methods
| 120 | Surveys of fish and game biologists/other professionals |
| 140 | Incidence of spills and/or fish kills |
| 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 |