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Lower Gallatin TPA Sediment

Page history last edited by Christina Staten 8 years, 4 months ago Saved with comment







Sediment is a naturally occurring component of healthy and stable stream systems. Excessive sediment entering streams, however, can upset the balance between naturally-occurring sediment transport and deposition, altering channel form and function, and may adversely impact fish and other aquatic life through a variety of mechanisms that may relate to: loss of habitat, warmer water temperatures, higher turbidity, and other stressors brought on by excessive sediment levels.


Map 4.1 Sediment-Impaired Streams (in RED) in the Lower Gallatin TMDL Planning Area



In order to evaluate water quality conditions in support of sediment TMDL development in the Lower Gallatin TPA, DEQ conducted sediment and habitat assessments on sediment-impaired streams during the summer of 2009, following the DEQ's Field Methodology for the Assessment of TMDL Sediment and Habitat Impairments.  Sediment and habitat assessments were performed at 23 monitoring sites chosen using the results of aerial assessment and field reconnaissance. Sediment and habitat assessments in 2009 evaluated existing in-stream conditions and assessed sediment loads from eroding streambanks. 


In addition to sediment and habitat field assessments, sediment contributions to impaied streams from upland areas and from paved and unpaved roads in the TPA were also assessed. Table 4.1 below provides an annotated list of downloadable documents, data, and reports related to sediment assessments in the Lower Gallatin TMDL Planning Area.



Table 4.1 Sediment Technical Assessments, Data and Reports


Document Description


Field Methodology for the Assessment of TMDL Sediment and Habitat Impairments  Sediment and habitat field methodolgy employed by Montana DEQ  for reach-scale assessment of sediment-impaired streams for TMDL development. March 2010 rev. 

2009 Lower Gallatin Sediment and Habitat Sampling and Analysis Plan

SAP for sediment, habitat and bank erosion data collection at 23 sites in the Lower Gallatin TPA.

September 2009

2009 Sediment, Habitat and Bank Erosion Assessment

Data and summary results of the 2009 sediment, habitat and bank erosion data collection effort.

June 2010

2010 Upland Sediment Assessment and Modeling Report

Results of USLE hillslope erosion model that estimates existing sediment loading and potential sediment load reductions through application of Best Management Practices (BMPs) to upland and tributary contributing areas.

June 2010

2010 Road Sediment Assessment and Modeling Report

Results of a sediment loading assessment of the paved and unpaved road network in the LGTPA.  Assessment of culverts and road sanding was also conducted.

December 2010





Project Coordinator

Nutrient & E.coli Project Manager

Christian Schmidt, DEQ



Sediment Project Manager

Lisa Kusnierz, EPA



Greater Gallatin Watershed Council (GGWC) Coordinator

Sierra Harris, GGWC



DEQ Nonpoint Source Program

Contact for information & assistance on implementing water quality improvement projects

Robert Ray, DEQ




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