Trinkle Creek IA 06-BOY-6351
from mouth in NE14 Sec 14 T85N R38W Crawford Co. to headwaters in S23 T85N R37W Crawford Co.
- Cycle
- 2018
- Release Status
- Final
- Overall IR
- 2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
- Trend
- Unknown
- Created
- 5/7/2019 8:28:44 AM
- Updated
- 5/7/2019 8:34:01 AM
The presumptive Class A1 (primary contact recreation) uses remain "not assessed" due to the lack of information upon which to base an assessment. The presumptive Class B(WW1) aquatic life uses are assessed (evaluated) as "fully supported" based on results of DNR/SHL biological sampling in 2013, 2014, 2015 and 2016.
This evaluated biological assessment of the presumptive Class B(WW1) aquatic life uses was based on data collected in 2013, 2014, 2015 and 2016 as part of the DNR/SHL headwater stream sampling project.A series of biological metrics that reflect stream water quality and habitat integrity were calculated from the biocriteria sampling data.The biological metrics are based on the numbers and types of benthic macroinvertebrate taxa and fish species collected in the stream sampling reach.The biological metrics were combined to make a fish community index of biotic integrity (FIBI) and a benthic macroinvertebrate index (BMIBI).The indexes rank the biological integrity of a stream sampling reach on a rising scale from 0 (minimum) to 100 (maximum).The FIBI scores (n=7) ranged from 18(poor) to 53 (good). The BMIBI scores (n=12) ranged from 52(fair) to 72 (good). The aquatic life use support was assessed (evaluated) as fully supporting (=FS), based on a comparison of the FIBI and BMIBI scores with biological impairment criteria (BIC) established from a statistical analysis of data collected at stream ecoregion reference sites from 1994-2008.The FIBI BIC for this ecoregion is 31 and the BMIBI BIC for this ecoregion is 54.Even though this site passed the FIBI BIC (4/7) and passed the BMIBI BIC (11/12), it is uncertain as to whether or not this segment is meeting the aquatic life criteria because it is a small headwater stream and doesn’t fall in the calibrated watershed size.