Floyd River IA 06-FLO-1552
mouth to West Branch Floyd R. in S2 T91N R46W Plymouth 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 8:13:03 AM
- Updated
- 12/28/2023 1:13:01 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" based on biological sampling data and on violations of the chronic water quality criteria for selenium. The Class HH use was assessed as "fully supporting" 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 10750001 Floyd
River near Sioux City
Iowa DNR 6 BIO See Below 184 Floyd
River James Iowa DNR 6 BIO See Below 1237 Floyd
River Hinton
(REMAP #420) 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 10750001 6 7/8/8 402 147 68 YES 4 / 3 3 / 3 1 / 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 10750001 6 36 / 3 7.5 9.3 8.2 1 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 10750001 6 Chloride 36 / 3 27 190 88 NA 0 / 0 7 NO Mon Full 10750001 6 Dissolved Oxygen 36 / 3 8 17.9 11.6 0 NA / NA 7 NO Mon Full 10750001 6 pH 36 / 3 7.5 9.3 8.2 1 NA / NA 7 NO Mon Full 10750001 6 Sulfate 36 / 3 62 190 119 0 NA / NA 7 NO Mon Full 10750001 6 Temperature 36 / 3 0 31.2 12.9 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 10750001 6 Ammonia 36 / 3 0.96 0.09 0.02 0 / 0 NO Mon Full 10750001 6 Cadmium 20 / 3 0.5 0.5 0.5 0 / 0 NO Mon Full 10750001 6 Chromium 20 / 3 2 0.83 0.7 0 / 0 NO Mon Full 10750001 6 Lead 20 / 3 1 0.91 1 0 / 0 NO Mon Full 10750001 6 Nickel 20 / 3 3.9 2.6 2.6 0 / 0 NO Mon Full 10750001 6 Selenium 18 / 2 12 8 8 0 / 18 YES Mon Not 10750001 6 Silver 20 / 3 1 0.902 1 0 / 0 NO Mon Full 10750001 6 Zinc 20 / 3 3.5 1.6 1.6 0 / 0 NO Mon 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 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* Community Assessment Type Assessment Result Support Level IR Category Reason Benthic
Macroinvertebrates Evaluated Fail (0/2) WINOFI *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. 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 10750001 6 Selenium 18 / 2 12 8 8 0 NO Mon Full
Class A1 - Indicator Bacteria:
Class A1 – pH:
Class BWW1 - Binomial Parameters:
Class BWW1 - Toxic Parameters:
Class BWW1 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Class HH-F - Toxic Parameters:
Assessment Key Dates
1/7/2020 | Monitoring Start |
9/14/2020 | Biological Monitoring |
9/9/2020 | Biological Monitoring |
12/13/2022 | Monitoring End |
Methods
200 | Physical/Chemical Monitoring |
315 | Regional reference site approach |
320 | Benthic macroinvertebrate surveys |
330 | Fish surveys |
420 | Indicator bacteria monitoring |