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State: Idaho
Waterbody ID:
Other ID: ID17040212SK013_05
State List ID: ID17040212SK013_05
Location:
State Waterbody Type: River
EPA Waterbody Type: Rivers and Streams
Water Size: 20.11
Units: miles
Watershed Name: Upper Snake-Rock
On This Page
- Causes of Impairment
- TMDLs That Apply to This Waterbody
- Previous Causes of Impairment Now Attaining All Uses
State: Idaho
Waterbody ID:
Other ID: ID17040212SK013_05
State List ID: ID17040212SK013_05
Location:
State Waterbody Type: River
EPA Waterbody Type: Rivers and Streams
Water Size: 20.11
Units: miles
Watershed Name: Upper Snake-Rock
2006 Waterbody Report for Rock Creek -River Mile 25 (T11s, R18e, Sec. 36) To Mouth
Waterbody Map Not Available
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- Pollution Categories Summary Document
Causes of Impairment for Reporting Year 2006
Description of this table
| Cause of Impairment | Cause of Impairment Group | State TMDL Development Status |
|---|---|---|
| Mercury | Mercury | TMDL needed |
TMDLs That Apply to this waterbody
No TMDL data have been recorded by EPA for this waterbody.
Previous Causes of Impairments Now Attaining All Uses
Description of this table
| Cause of Impairment | Cycles Listed | WQS Attainment Date | WQS Attainment Reason | WQS Attainment Comments |
|---|---|---|---|---|
| Ammonia, Un-ionized | 2002 | Feb-04-2009 | Applicable WQS attained; reason for recovery unspecified. | No un-ionized ammonia instream targets have been proposed on the Middle Snake River. However, as a consequence of TSS reductions, it is expected to that acceptable levels of un-ionized ammonia will be reduced as well. (See Upper Snake Rock Watershed Management Plan pg 173-174) |
| Mercury | 2004, 2006, 2008 | Sep-29-2011 | Applicable WQS attained; original basis for listing was incorrect. | 2/18/2010 - The 2007 mercury data collected by USGS was calculated in error. When the data was recalculated, the results were below the human health criterion for mercury. NED |
| Mercury | 2004, 2006, 2008 | Sep-29-2011 | Applicable WQS attained; original basis for listing was incorrect. | 2/18/2010 - The 2007 mercury data collected by USGS was calculated in error. When the data was recalculated, the results were below the human health criterion for mercury. NED |
| Mercury | 2004, 2006, 2008 | Sep-29-2011 | Applicable WQS attained; original basis for listing was incorrect. | 2/18/2010 - The 2007 mercury data collected by USGS was calculated in error. When the data was recalculated, the results were below the human health criterion for mercury. NED |
| Oil and Grease | 2002 | Feb-04-2009 | Applicable WQS attained; reason for recovery unspecified. | Bi-monthly monitoring over the course of an entire year found no exceedance (<4 mg/L). Therefore, the Upper Snake Rock Watershed Management Plan proposes that oil and grease be" de-listed" as a pollutant of Rock Creek. See pg 176 of the USRWMP |