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
- 2024
- Release Status
- Pending
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 11/1/2023 8:12:39 AM
- Updated
- 2/1/2024 6:57:52 AM
Assessment Summary
The Class A1 use was assessed as "not 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 "WINOFI" based on biological sampling data. The Class HH use was assessed as "fully supported" based on water quality monitoring data.
Assessment Explanation
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2020-2022 10670002 Maple River near
Mapleton Iowa DNR 6 BIO See Below 366 Maple River Turin (REMAP #21) Iowa DNR 6 WQ 2021 415 Maple River Castana (REMAP #110) Iowa DNR 6 BIO See Below 415 Maple River Castana (REMAP #110) Iowa DNR 6 BIO See Below 926 Maple River Mapleton Iowa DNR 6 BIO See Below 1208 Maple River NE of Mapleton
(REMAP #447)
Class A1 - Indicator
Bacteria: Site ID Data Source ID # Samples per Year (2020/ 2021/2022) 2020 Geometric Mean 2021 Geometric Mean 2022 Geometric Mean Violates Annual Geometric Mean? # 2020 SSM violations / SSM Violations needed for impairment # 2021 SSM violations / SSM Violations needed for impairment # 2022 SSM violations / SSM Violations needed for impairment Violates Annual SSM Significantly >10% Rule? Assessment Type Support Level 10670002 6 8/8/8 305 297 137 YES 4 / 3 3 / 3 3 / 3 YES Mon Not 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 10670002 6 36 / 3 7.2 8.5 8.1 0 7 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 10670002 6 Chloride 36 / 3 15 46 21 NA 0 / 0 7 NO Mon Full 10670002 6 Dissolved Oxygen 36 / 3 7 13.3 10.3 0 NA / NA 7 NO Mon Full 10670002 6 pH 36 / 3 7.2 8.5 8.1 0 NA / NA 7 NO Mon Full 10670002 6 Sulfate 36 / 3 37 100 64 0 NA / NA 7 NO Mon Full 10670002 6 Temperature 36 / 3 0 26.9 11.8 0 NA / NA 7 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 10670002 6 Ammonia 36 / 3 0.49 0.04 0.02 0 / 0 NO Mon Full 10670002 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10670002 6 Chromium 20 / 3 4 0.93 0.72 0 / 0 NO Mon Full 10670002 6 Lead 20 / 3 1 0.91 1 0 / 0 NO Mon Full 10670002 6 Nickel 20 / 3 2.9 1.6 1.4 0 / 0 NO Mon Full 10670002 6 Selenium 18 / 2 9 6 6 0 / 13 YES Mon Not 10670002 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10670002 6 Zinc 20 / 3 4 1 0.5 0 / 0 NO Mon Full
Benthic Macroinvertebrates: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47d/e/m BMIBI BIT BMIBI Pass/Fail 415 9/20/21 724.4 47m MO Floating ArtSub 39 Fair 54 Fail 366 9/1/20 731.8 47d MO Floating ArtSub 30 Poor 54 Fail 1208 8/31/20 629.0 47e MO Surber 47 Fair 54 Fail 926 8/13/19 669.0 47m MO Floating ArtSub 36 Fair 54 Fail Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47d/e FIBI BIT FIBI Pass/Fail 415 9/20/21 724.4 47m MO NA 42 Fair 31 Pass 366 9/1/20 732 47d MO NA 3 Poor 31 Fail 1208 8/31/20 629 47e MO NA 29 Fair 31 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/4) WINOFI Fish Evaluated Fail (1/3) WINOFI Assessment was evaluated because the
drainage areas Overall Evaluated Fail WINOFI 3bu of the sites were greater than the
calibrated range. Class BWW1- Continuous
DO Monitoring: Site ID Data Source ID # Days Monitoring (2019/2020/2021) DO Criteria Type # 2019 violations / Violations needed for impairment # 2020 violations / Violations needed for impairment # 2021 violations / Violations needed for impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level 24 hr 0/12 0/4 0/5 No 415(21) 6 73/14/19 16 hr 0/12 0/4 0/5 No Monitored Full 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 Selenium 18 / 2 9 6 6 0 NO Mon Full
Class A1 – pH:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 - Biological Sampling:
Fish:
Overall:
366/
Assessment Key Dates
12/13/2022 | Monitoring End |
9/20/2021 | Biological Monitoring |
1/7/2020 | Monitoring Start |
9/1/2020 | Biological Monitoring |
8/31/2020 | Biological Monitoring |
8/13/2019 | Biological Monitoring |
Methods
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
330 | Fish surveys |
420 | Indicator bacteria monitoring |