Floyd River IA 06-FLO-1552
mouth to West Branch Floyd R. in S2 T91N R46W Plymouth 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
- 12/28/2021 5:55:01 AM
- Updated
- 1/14/2022 9:42:29 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" based on biological sampling data and on violations of the chronic water quality criteria for selenium. 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 10750001 Floyd River near Sioux City
Iowa
DNR 6 BIO See
Below 1237 Floyd River Hinton – REMAP #420 Iowa
DNR 6 BIO See
Below 184 Floyd River James 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 10750001 6 0/0/7 NA NA 402 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 10750001 6 36 / 3 7.2 8.6 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 10750001 6 Ammonia 36 / 3 0.025 1.4 0.1 NA 0 / 0 7 NO Monitored Full 10750001 6 Chloride 36 / 3 14 80 41 NA 0 / 0 7 NO Monitored Full 10750001 6 Dissolved Oxygen 36 / 3 6.1 13.7 10.4 0 NA / NA 7 NO Monitored Full 10750001 6 pH 36 / 3 7.2 8.6 8.1 0 NA / NA 7 NO Monitored Full 10750001 6 Sulfate 36 / 3 40 140 92 0 NA / NA 7 NO Monitored Full 10750001 6 Temperature 36 / 3 0 27.1 11.3 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 10750001 6 Aluminum 14 / 3 21 5.58 3.05 0 / 0 NO Monitored Full 10750001 6 Arsenic 13 / 3 3.2 2.4 2.2 0 / 0 NO Monitored Full 10750001 6 Cadmium 13 / 3 0.13 0.06 0.05 0 / 0 NO Monitored Full 10750001 6 Chromium 13 / 3 1.8 0.9 0.9 0 / 0 NO Monitored Full 10750001 6 Lead 13 / 3 1.5 0.3 0.2 0 / 0 NO Monitored Full 10750001 6 Nickel 13 / 3 5.8 4 3.9 0 / 0 NO Monitored Full 10750001 6 Selenium 13 / 3 17 8.1 7.5 0 / 11 YES Monitored Not 10750001 6 Silver 13 / 3 0.025 0.025 0.025 0 / 0 NO Monitored Full 10750001 6 Zinc 13 / 3 7.5 2.8 2.5 0 / 0 NO Monitored Full Site ID Date Drainage Area (mi2) Ecoregion Major Drainage BM Sample Gear BMIBI score BMIBI Class 47e BMIBI BIT BMIBI Pass/Fail 1237 9/14/20 867 47e MO Floating Art Sub 24 Poor 54 Fail 184 9/9/20 886 47e MO Floating Art Sub 26 Poor 54 Fail 184 8/30/16 886 47e MO Floating Art Sub 45 Fair 54 Fail Fish: Site ID Date Drainage Area (mi2) Ecoregion Major Drainage Riffle Stream? FIBI score FIBI Class 47e FIBI BIT FIBI Pass/Fail 1237 9/14/20 867 47e MO NA 26 Fair 31 Pass Overall: Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/3) Not The
FIBI score passed using the 7 point UAV applied to single samples. Fish Evaluated Pass (1/1) Full 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 - Biological Sampling:
Benthic Macroinvertebrates:
Class HH – No Data
Assessment Key Dates
1/9/2018 | Fixed Monitoring Start Date |
9/14/2020 | Biological Monitoring |
9/9/2020 | Biological Monitoring |
8/30/2016 | Biological Monitoring |
12/2/2020 | Fixed Monitoring End Date |
Methods
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 |