Maple River IA 06-LSR-1581
mouth (S17 T83N R44W Monona Co.) to confluence with unnamed tributary approximately 1 mile east of Danbury in SW 1/4 NE 1/4 S26 T86N R42W Woodbury 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
- 9/22/2020 7:21:39 AM
- Updated
- 10/13/2020 2:36:49 PM
Assessment Summary
The Class A1 use remains assessed as "partially supported" due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class BWW1 use was assessed as "not supported” due to violations of state water quality chronic criteria for selenium and "partially supported" based on biological sampling data. The Class HH use was assessed as "fully supported" based on 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 2014-2016, CY 2016-2018 10670002 Maple River near Mapleton
Iowa DNR 6 BIO See Below 366 Maple River Turin – REMAP #21 Iowa DNR 6 BIO See Below 415 Maple River Castana – REMAP #110 Iowa DNR 6 BIO See Below 926 Maple River Mapleton Class
A1 - Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2014 Geometric Mean 2015 Geometric Mean 2016 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 10670002 6 24 / 3 456 814 691 Yes 17 71% Yes Evaluated 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 10670002 6 33 / 3 8.5 8.2 8.3 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 10670002 6 Ammonia 33 / 3 0.51 0.05 0.02 0 / 0 0% / 0% No Monitored Full 10670002 6 Chloride 36 / 3 38 17 16 0 / 0 0% / 0% No Monitored Full 10670002 6 Dissolved oxygen 36 / 3 14.4 10.5 10.4 NA / 0 NA / 0% No Monitored Full 10670002 6 pH 33 / 3 8.5 8.2 8.3 0 / NA 0% / NA No Monitored Full 10670002 6 Sulfate 36 / 3 74 51 49 0 / NA 0% / NA No Monitored Full 10670002 6 Temperature 36 / 3 25.9 11.8 10.6 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 10670002 6 Aluminum 9 / 2 20 5.67 1.7 0 / 0 0% / 0% No Evaluated Full 10670002 6 Arsenic 9 / 2 3.1 2 1.8 0 / 0 0% / 0% No Evaluated Full 10670002 6 Cadmium 9 / 2 0.025 0.025 0.025 0 / 0 0% / 0% No Evaluated Full 10670002 6 Chromium 9 / 2 1.2 0.75 0.84 0 / 0 0% / 0% No Evaluated Full 10670002 6 Copper 9 / 2 4.5 1.16 0.65 0 / 0 0% / 0% No Evaluated Full 10670002 6 Lead 9 / 2 0.25 0.094 0.08 0 / 0 0% / 0% No Evaluated Full 10670002 6 Nickel 9 / 2 5.3 2.7 2.3 0 / 0 0% / 0% No Evaluated Full 10670002 6 Selenium 9 / 2 11 7.2 6.6 0 / 7 0% / 78% Yes Evaluated Not 10670002 6 Zinc 9 / 2 4.3 1.58 1.3 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 47m BMIBI BIT BMIBI Pass/ Fail 926 8/30/16 669 47m MO/WW Float ArtSub 39 Fair 54 Fail 926 7/30/13 669 47m MO/WW Float ArtSub 62 Good 54 Pass 926 9/5/12 669 47m MO/WW ArtSub 34 Fair 54 Fail Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal Riffle Stream? FIBI score FIBI Class 47d/47m FIBI BIT FIBI Pass/ Fail 415 8/25/04 724 47m MO/WW NA 14 Poor 31 Fail 366 8/26/03 732 47d MO/WW NA 9 Poor 31 Fail
Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (1/3) Partial Fish Evaluated Fail (0/2) Not 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-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 10670002 6 Cadmium 9 / 2 0.025 0.025 0.025 9 No Evaluated Full 10670002 6 Chromium 9 / 2 1.2 0.75 0.84 0 No Evaluated Full 10670002 6 Copper 9 / 2 4.5 1.16 0.65 0 No Evaluated Full 10670002 6 Nickel 9 / 2 5.3 2.7 2.3 0 No Evaluated Full 10670002 6 Selenium 9 / 2 11 7.2 6.6 0 No Evaluated Full 10670002 6 Zinc 9 / 2 4.3 1.58 1.3 0 No Evaluated Full
Assessment Key Dates
| 1/8/2014 | Fixed Monitoring Start Date |
| 12/7/2016 | Fixed Monitoring End Date |
| 8/26/2003 | Biological Monitoring |
| 8/25/2004 | Biological Monitoring |
| 9/5/2012 | Biological Monitoring |
| 7/30/2013 | Biological Monitoring |
| 8/30/2016 | Biological Monitoring |
| 1/5/2016 | Fixed Monitoring Start Date |
| 12/5/2018 | Fixed Monitoring End Date |
Methods
| 150 | Monitoring data more than 5 years old |
| 230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
| 315 | Regional reference site approach |
| 320 | Benthic macroinvertebrate surveys |
| 330 | Fish surveys |
| 420 | Indicator bacteria monitoring |