Floyd River IA 06-FLO-1554
from city of Alton (north line S11 T94N R44W Sioux Co.) to confluence with North Fork Floyd R. in S9 T97N R41W O'Brien Co.
- Cycle
- 2022
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 12/9/2021 12:37:12 PM
- Updated
- 1/25/2022 3:34:14 PM
| Cycle Added | Class | Cause | Data Source | Rationale |
|---|---|---|---|---|
| 2004 | Class BWW2 | Fish Kill: Caused By Fertilizer Spill | Biological monitoring: Iowa DNR fish kill follow-up | New data: recovery of fish community from pollutant-caused fish kill |
| 2004 | Class BWW2 | Fish Kill: Caused By Animal Waste | Biological monitoring: Iowa DNR fish kill follow-up | New data: recovery of fish community from pollutant-caused fish kill |
The Class BWW2 use was assessed as “not supported” based on biological sampling data. Biological sampling data collected in 2020 showed recovery of the fish community in this segment from the fish kills. Based on the 2020 fish sampling data, the two 5b fish kill impairments were de-listed. Furthermore, the Class BWW2 was assessed as "fully supported" based on continuous dissolved oxygen monitoring data. All other designated uses were "not assessed."
Data Sources: Data
Source Data
Source ID Data
Type Data
Age Site
ID Site Name Site Description Iowa
DNR 6 BIO See
Below 355 Floyd River Sanborn – REMAP #67 Iowa
DNR 6 BIO See
Below 364 Floyd River Alton – REMAP #85 Site
ID Date Drainage
Area (mi2) Ecoregion Major
Drainage BM
Sample Gear BMIBI
score BMIBI
Class 47a
BMIBI BIT BMIBI
Pass/Fail 355 8/18/20 43.9 47a MO Floating
Art Sub 26 Poor 54 Fail 364 8/17/20 260.6 47a MO Floating
Art Sub 62 Good 54 Pass Fish: Site
ID Date Drainage
Area (mi2) Ecoregion Major
Drainage Riffle
Stream? FIBI
score FIBI
Class 47a
FIBI BIT FIBI
Pass/Fail 355 8/18/20 43.9 47a MO NA 28 Fair 43 Fail 364 8/17/20 260.6 47a MO NA 36 Fair 43 Fail Overall: Community Assessment
Type Assessment
Result Support
Level IR
Category Reason Benthic Macroinvertebrates Evaluated Fail
(1/2) Not Fish Evaluated Fail
(0/2) Not 5bt Assessment was evaluated because the samples used to
complete the Overall Evaluated Fail Not assessment were collected in a single year. Class BWW2 – Fishkill
Assessment: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/ Thermal Fish per mile REMAP 25 % fish per mile >REMAP 25 % fish per mile? 2000 305b fish taxa present Fish Taxa Present % 364 8/17/20 260.6 47a MO/WW 939.84 524.1 Yes (Pass) 8/9 89% (Pass) 355 8/18/20 43.9 47a MO/WW 1362.24 524.1 Yes (Pass) 7/9 78% (Pass) The Class BWW2 use
previously resided in Category 5b (two impairments) based on 2002, 2003, 2007 and 2018 fish
kills. This segment’s fish community was sampled in 2020 (twice) as part of the DNR
fish kill follow-up sampling program. The results from this follow-up
sampling and comparison to ecoregion averages suggest that the fish community
of this segment is similar to non-fish kill impacted streams. Based on the fish
kill follow-up sampling results, the Category for the fish kill assessment
was changed from 5b to 3a (not assessed). Class
BWW2- 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 NA 0/5 No
355 6 0/0/0/0/21 16 hr NA NA NA NA 0/5 No Monitored Full
24 hr NA NA NA NA 0/5 No
364 6 0/0/0/0/19 16 hr NA NA NA NA 0/5 No Monitored Full
Presumptive Class A1 – No Data
Class BWW2 - Biological Sampling:
Benthic Macroinvertebrates: