LOWER GALLATIN TMDL PLANNING AREA home
NUTRIENTS SEDIMENT E.COLI OUTREACH
LOWER GALLATIN TMDL DOCUMENT
The "Lower Gallatin Planning Area TMDLs & Framework Water Quality Improvement Plan" was approved by EPA on March 28, 2013. The final document can be found on DEQ's Final TMDL Documents website at: http://deq.mt.gov/wqinfo/TMDL/finalReports.mcpx. Responses to comments can be found in Appendix H.
If you have questions, please contact Christian Schmidt at cschmidt2@mt.gov or (406) 444-6777.
The stakeholder review draft version of the document has been removed from this page. Descriptions of the document sections can still be found below.
Document Section
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Section Contents
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Sections 1 -4
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1.0: Introduction
2.0: Lower Gallatin Watershed Description
3.0: Montana Water Quality Standards
4.0: Defining TMDLs & Their Components
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Section 5: Sediment TMDL Components
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Detailed evaluation of sediment water quality standards, and calculation of pollutant source loading estimates, TMDLs, and allocations for sediment.
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Section 6: Nutrient TMDL Components
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Detailed evaluation of nutrient water quality standards, and calculation of pollutant source loading estimates, TMDLs, and allocations for applicable nutrients.
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Section 7: E. Coli TMDL Components
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Detailed evaluation of pathogen water quality standards, and calculation of pollutant source loading estimates, TMDLs, and allocations for E. coli.
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Sections 8 -10
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8.0: Other Identified Issues or Concerns
9:0: Restoration Objectives and Implementation Strategy
10.0: Monitoring Strategy
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Appendix
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Appendix Description
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Appendix A: Tables & Figures
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Contains Table A-1 and all maps and figures for the Lower Gallatin Watershed Description found in Section 2.0 of the document.
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Appendix B: Regulatory Framework & Reference Condition Approach
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Contains more detailed information about legal requirements for developing TMDLs; Montana’s sediment, nutrient, and pathogen water quality standards; and the approach taken to evaluate reference conditions.
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Appendix C: Road Sediment Assessment
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Contains a sediment load analysis and culvert assessment for the road network in the Lower Gallatin River TMDL Planning Area.
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Appendix D: Sediment Daily Loads
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Contains the sediment TMDLs expressed as daily loads (tons/day). Section 5.0 of the document expresses the sediment TMDLs in tons/year.
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Appendix E: Hyalite Creek Nutrient Listing History and TMDL Development
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Outlines the impairment listing history of Hyalite Creek and the reasoning and support behind the decision to address a nutrient impairment on the lower segment of Hyalite Creek.
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Appendix F: Nutrient Existing Load Source Assessment in the Lower Gallatin TMDL Planning Area
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Outlines the process by which existing nutrient loads were quantified and allocated to nonpoint sources in impaired stream segments at baseflow conditions.
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Attachment
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Attachment Description
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Attachment A: Sediment and Habitat Data and Bank Erosion Assessment
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A detailed sediment and habitat assessment of streams was conducted to facilitate development of the sediment TMDLs. This appendix summarizes the aerial assessment reach stratification, sediment and habitat assessment, and streambank erosion assessment methods used for this process.
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Attachment B: 2009 Lower Gallatin TMDL Planning Area Nutrient, Algae, and E. Coli Source Assessment
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Contains the results of a 2009 GIS and field-based pollutant source assessment was completed on twelve streams in the Lower Gallatin TMDL Planning Area.
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Attachment C: Upland Sediment Assessment
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Sediment loading from hillslope erosion was modeled using a universal soil loss equation based model that was combined with a sediment delivery ratio and a riparian health assessment to predict sediment delivery to streams. This report presents the results of this assessment and modeling effort.
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Attachment D: Scientific and Technical Basis of the Numeric Nutrient Criteria for Montana’s Wadeable Streams and Rivers: Addendum 1, May 2012
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This document is the first update by the Dept. of Environmental Quality to the numeric nutrient criteria recommendations it made in 2008.
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CONTACT INFORMATION
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Last Updated: May 10, 2013