Fox River IA 04-FOX-995
from unnamed tributary (NW 1/4 S6 T68N R12W Davis Co.) to confluence with unnamed tributary in S29 T69N R15W Davis Co.
- Cycle
- 2020
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 9/10/2020 10:50:29 AM
- Updated
- 10/12/2020 9:54:14 AM
The presumptive Class A1 primary contact recreation use remains assessed as “partially supported” due to 2009 levels of indicator bacteria that exceeded state water quality criteria. The Class BWW2 aquatic life use remains assessed as "partially supported" based on 2010 and 2013 biological sampling data and on 2002 continuous water quality monitoring data. All other designated uses were "not assessed".
Sources of
Data: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 BIO See Below 300 Fox River Bloomfield – REMAP #48 Iowa DNR 6 BIO See Below 756 Fox River Drakesville Iowa DNR 6 BIO See Below 757 Fox River West Grove – ID#2 USGS 11 WQ CY 2009 5494200 Fox River near West Grove, IA
USGS 11 WQ CY 2009 5494250 Fox River near Paris, IA
USGS 11 WQ CY 2009 5494300 Fox River at Bloomfield, IA
USGS 11 WQ CY 2009 5494350 Fox River at Co HWY J40 near Bloomfield,
IA
Class A1 -
Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2009 Geometric Mean Annual Geometric Mean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 5494200 11 8 / 1 202 Yes 2 25% Unknown (<10 samples) Evaluated Partial 5494250 11 8 / 1 214 Yes 1 12% Unknown (<10 samples) Evaluated Partial 5494300 11 8 / 1 336 Yes 3 38% Unknown (<10 samples) Evaluated Partial 5494350 11 8 / 1 305 Yes 1 12% Unknown (<10 samples) Evaluated Partial Class
BWW2 - Biological Sampling: Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class 40a BMIBI BIT BMIBI Pass/ Fail 300 7/15/13 101 40a MS/WW ArtSub 16 Poor 41 Fail 757 10/4/10 64 40a MS/WW Hess 49 Fair 41 Pass 757 10/4/10 64 40a MS/WW ArtSub 55 Fair 41 Pass Fish: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 40a FIBI BIT FIBI Pass/ Fail 300 7/15/13 101 40a MS/WW NA 20 Poor 33 Fail 756 10/5/10 74 40a MS/WW NA 30 Fair 33 Fail 757 10/4/10 64 40a MS/WW NA 24 Poor 33 Fail Overall: Community Assessment Type Assessment Result Support Level Earned IR Category Actual IR Category Reason Benthic
Macroinvertebrates Evaluated Pass (2/3) Full Fish Evaluated Fail (0/3) Partial Overall Evaluated Fail Partial 3bc 5bt Assessment
is evaluated because it included samples not collected in the last five years. Class
BWW2 – Continuous Monitoring: As
part of the REMAP project, diurnal dissolved oxygen and temperature monitoring
conducted during July 2002 found dissolved oxygen levels sagging to
approximately 4.2 mg/L during night hours. Additional sampling data are needed
to evaluate the extent, causes and sources of this water quality problem.
Stream physical habitat assessment found excessive sediment deposits and a lack
of instream cover that could also contribute to the biological impairment. The
wide-shallow channel probably contributes to observed high stream temperature
(>36C) and high rates of biological community respiration and primary
production.