Lotts Creek IA 05-GRA-1376
IA/MO line (S24 TT67N R29W Ringgold Co.) to confluence with Tuckers Cr. in S12 T67N R29W Ringgold Co.
| Cycle Added | Class | Cause | Data Source | Rationale |
|---|---|---|---|---|
| 2006 | Class BWW2 | Biological: low fish IBI | Biological monitoring: Iowa DNR WQMA | New data: recovery of fish/invertebrate community |
The Class BWW2 use was assessed as "not supported"; however, the Category 5bv impairment was delisted and moved to Category 4c (Non-pollutant caused impairment. No TMDL needed) based on biological and physical habitat sampling data. All other designated uses remain "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 60 Lotts Creek Ringgold SWMA – Lamoni BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear BMIBI score BMIBI Class 40a BMIBI BIT BMIBI Pass/Fail 60 8/2/22 61.1 40a MO/WW Surber 57 Good 41 Pass 60 7/17/18 61.1 40a MO/WW Surber 63 Good 41 Pass BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal Riffle Stream? FIBI score FIBI Class 40a FIBI BIT FIBI Pass/Fail 60 8/2/22 61.1 40a MO/WW NA 35 Fair 33 Pass 60 7/17/18 61.1 40a MO/WW NA 31 Fair 33 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Pass (2/2) Full Fish Evaluated Fail (1/2) Not
Overall Evaluated Fail Not 4c Category 5bv
impairment delisted, Category 4c habitat impairment remains. +8 to -5 points, water
quality and/or other factors besides physical habitat do not limit the stream’s
ability to meet the FIBI BIT. The fact that EFHI scores are below the 40a FIBI
BIT is an indication that Lotts
Creek will have difficulty meeting the 40a FIBI BIT because of habitat
conditions at the site. In addition, because both the 2018 and 2022 BMIBI
scores overwhelmingly passed
the 40a BMIBI BIT is an indication that there is not a water quality problem in
this segment. BioNet Site ID Sample Date FIBI Score 40a FIBI BIT EFHI Score FIBI-BIT Difference FIBI-EFHI Difference EFHI-BIT Difference 60 8/2/22 35 33 27 2 8 -6 60 7/17/18 31 33 28 -2 3 -5
Presumptive Class A1 - No Data
Class BWW2 - Biological Sampling:
Benthic Macroinvertebrates:
Fish:
Overall:
Class BWW2 – Habitat Index Evaluation:
For Lotts Creek, the observed FIBI scores were higher than the
EFHI-predicted FIBI scores. When the observed FIBI score-EFHI-predicted FIBI
score difference is