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
- 2022
- Release Status
- Final
- Data Collection Period
- Overall IR Category
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Stable
- Created
- 12/15/2021 2:39:09 PM
- Updated
- 1/25/2022 3:48:26 PM
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 based on biological sampling data. All other designated uses were "not assessed."
Assessment Explanation
Data Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2018-2020 10670002 Maple River near Mapleton
Iowa DNR 6 BIO See Below 366 Maple
River Turin
– REMAP #21 Iowa DNR 6 BIO See Below 1208 Maple
River NE
of Mapleton – REMAP #447 Iowa DNR 6 BIO See Below 926 Maple
River Mapleton Class A1 -
Indicator Bacteria: Site ID Data Source ID # Samples per Year (2018/ 2019/2020) 2018 Geometric Mean 2019 Geometric Mean 2020 Geometric Mean Violates Annual Geometric Mean? # 2018 SSM violations / SSM Violations
needed for impairment # 2019 SSM violations / SSM Violations
needed for impairment # 2020 SSM violations / SSM Violations
needed for impairment Violates Annual SSM Significantly >10%
Rule? Assessment Type Support Level 10670002 6 0/0/8 NA NA 305 YES NA NA 4 / 3 YES Monitored Not Class A – 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 10670002 6 35 / 3 7 8.5 8.1 0 7 NO Monitored Full Class BWW1 - Conventional
Parameters: 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 Ammonia 35 / 3 0.025 2.1 0.1 NA 0 / 0 7 NO Monitored Full 10670002 6 Chloride 36 / 3 12 46 18 NA 0 / 0 7 NO Monitored Full 10670002 6 Dissolved Oxygen 36 / 3 7.6 14.4 10.5 0 NA / NA 7 NO Monitored Full 10670002 6 pH 35 / 3 7 8.5 8.1 0 NA / NA 7 NO Monitored Full 10670002 6 Sulfate 36 / 3 31 81 50 0 NA / NA 7 NO Monitored Full 10670002 6 Temperature 36 / 3 0 26 11 0 NA / NA 7 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 >1 Acute / Chronic Violation Assessment Type Support Level 10670002 6 Aluminum 14 / 3 20 4.6 2.7 0 / 0 NO Monitored Full 10670002 6 Arsenic 13 / 3 3.1 2 1.8 0 / 0 NO Monitored Full 10670002 6 Cadmium 13 / 3 0.05 0.03 0.02 0 / 0 NO Monitored Full 10670002 6 Chromium 13 / 3 1.3 0.8 0.9 0 / 0 NO Monitored Full 10670002 6 Lead 13 / 3 0.25 0.13 0.1 0 / 0 NO Monitored Full 10670002 6 Nickel 13 / 3 5.5 3.4 3.2 0 / 0 NO Monitored Full 10670002 6 Selenium 13 / 3 11 6.6 6.6 0 / 10 YES Monitored Not 10670002 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10670002 6 Zinc 13 / 3 4.3 2.5 2.3 0 / 0 NO Monitored Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47d/e/m BMIBI BIT BMIBI Pass/Fail 366 9/1/20 732 47d MO Floating ArtSub 30 Poor 54 Fail 1208 8/31/20 629 47e MO Surber 47 Fair 54 Fail 926 8/13/19 669 47m MO Floating ArtSub 36 Fair 54 Fail 926 8/30/16 669 47m MO Floating ArtSub 39 Fair 54 Fail Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47d/e FIBI BIT FIBI Pass/Fail 366 9/1/20 732 47d MO NA 3 Poor 31 Fail 1208 8/31/20 629 47e MO NA 29 Fair 31 Fail Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/4) Not
Fish Evaluated Fail (0/2) Not Assessment was evaluated
because the drainage areas of the sites used Overall Evaluated Fail WINOFI 3bu for the assessment were
greater than the calibrated range. Class
BWW1- Continuous DO Monitoring: Site ID Data Source ID # Days Monitoring (2016/2017/2018/ 2019/2020) DO Criteria Type # 2016 violations /
Violations needed for impairment # 2017 violations /
Violations needed for impairment # 2018 violations
/ Violations needed for impairment # 2019 violations /
Violations needed for impairment # 2020 violations /
Violations needed for impairment Violates Annual Significantly >10% Rule? Assessment Type Support Level
24 hr NA NA NA 0/12 0/4 No
366 6 0/0/0/73/14 16 hr NA NA NA 0/12 0/4 No Monitored Full
Class HH – No Data
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Assessment Key Dates
| 12/2/2020 | Fixed Monitoring End Date |
| 8/30/2016 | Biological Monitoring |
| 1/9/2018 | Fixed Monitoring Start Date |
| 9/1/2020 | Biological Monitoring |
| 8/31/2020 | Biological Monitoring |
| 8/13/2019 | Biological Monitoring |
Methods
| 222 | Non-fixed-station monitoring (conventional during key seasons and flows) |
| 230 | Fixed station physical/chemical (conventional plus toxic pollutants) |
| 315 | Regional reference site approach |
| 320 | Benthic macroinvertebrate surveys |
| 330 | Fish surveys |
| 380 | Quantitative physical habitat assessment |
| 420 | Indicator bacteria monitoring |