Draft California 2020 Integrated Report (303(d) List/305(b) Report)

Supporting Information

Regional Board 1 - North Coast Region

Water Body Name: Winchuck River HU, Winchuck River
Water Body ID: CAR1010001119990617135614
Water Body Type: River & Stream
Region 1     
Winchuck River HU, Winchuck River
Pollutant: Sediment
Final Listing Decision: Do Not List on 303(d) list (TMDL required list)
Last Listing Cycle's Final Listing Decision: Do Not List on 303(d) list (TMDL required list)(2016)
Revision Status Original
Impairment from Pollutant or Pollution: Pollutant
Regional Board Conclusion: Regional Water Board Conclusion:

This pollutant was considered for placement on the section 303(d) List in a previous Integrated Report cycle.

No new information was reviewed for this current Integrated Report cycle. Therefore, the previous conclusion remains unchanged, and is as follows:

This pollutant is being considered for placement on the section 303(d) list under section 3 of the Listing Policy. Under section 3 a single line of evidence is necessary to assess listing status.

Based on the readily available data and information, the weight of evidence indicates that there is insufficient justification in favor of placing this water segment-pollutant combination on the Section 303(d) List in the Water Quality Limited Segments category.

This conclusion is based on the staff findings that:
1. The documents submitted do not contain substantial information for listing, more data is needed to determine if the water quality objective is exceeded.
2. Pursuant to section 3.11 of the Listing Policy, no additional data and information are available indicating that standards are not met.
Regional Board Decision Recommendation: This region was not assessed this cycle. All decisions have been carried over from the previous cycle and remain the same.
State Board Review of Regional Board Conclusion and Recommendation:
State Board Decision Recommendation: After review of this Regional Board decision, SWRCB staff recommend the decision be approved by the State Board.
Line of Evidence (LOE) for Decision ID 68113, Sediment
Region 1     
Winchuck River HU, Winchuck River
LOE ID: 1637
Pollutant: Sediment
LOE Subgroup: Pollutant-Water
Matrix: Not Specified
Fraction: None
Beneficial Use: Cold Freshwater Habitat
Number of Samples: 0
Number of Exceedances: 0
Data and Information Type: Not Specified
Data Used to Assess Water Quality: The reports and plans were submitted for potential sedimentation impairments include: Winchuck River Watershed Action Plan, Curry Action Plan, and Winchuck River Watershed Assessment. Most of information in these documents contain historical documentation of degradation of the watershed, narrative evaluation of roads, crossing, and watercourses within these areas while conducting preharvest inspections for proposed timber harvest plans. Also, Coho has been listed as Threatened, according to the Endangered Species Act, since May of 1997. Even though the information submitted does not contain substantial information for listing, there does appears to be enough evidence that warrants further investigation of habitat degradation in watershed (Maguire, 2001; Massingill, 2001; Massingill, 2002).
Data Reference: Placeholder reference 2006 303(d)
Water Quality Objective/Criterion: The suspended sediment load and suspended sediment discharge rate of surface water shall not be altered in such a manner as to cause nuisance or adversely affect beneficial uses.
Objective/Criterion Reference: Placeholder reference 2006 303(d)
Evaluation Guideline:
Guideline Reference:
Spatial Representation:
Temporal Representation:
Environmental Conditions:
QAPP Information: QA Info Missing
QAPP Information Reference(s):