WSP11210

• File Number: 8040.960
• Description: Section D General Studies - Dams
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/2004
• Author: Denver Water
• Title: Williams Fork Hydroelectric Project - FERC Number 2204 - Erosion Survey Report
• Water Supply Pro - Doc Type: Report/Study

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APPENDIX A

Erosion Survey Data

Williams Fork Reservoir - Erosion Surve J
Class
Unique Classification Ranking
Numerical Sile or Erosion Active or (4=severe.
Identifier Type Type Soil Composition Inactive l=mlnimall Resource Risk
Sandy Gravelly Aesthetics, near
ER02-1701* RSB** Bank cut with cobble to 6" Active 4 camDlITound
ER02-1702 RSB Bank cut Fractured bedrock Active 4 None
Aesthetics, viewed
Sandy with cobble trom houses across
ER02-l703 RSB Bank cut to 12" Active 4 reservoi r
Sandy with large Minor loss of
ER02-l704 RSB Bank cut cobbles Active 3 upland
Sandy with very Minor loss of
ER02-1705 RSB Bank cut little small cobble Active 4 upland
Sandy with cobble
ER02-1706 RSB Bank cut/sheet to 10" Inacti ve 2 None
Sandy with large Minor loss of
ER02-1707 RSB Bank cut cobbles Active 4 upland
Sandy Gravelly
ER02-l708 RSB Bank cut with cobble to 4" Active 4 None
ER02-1709 RSB Bank cut Sandv/Clay Active 4 None
Sandy and gri t Aesthetics of
with small chert camping/boat
ER02-l710 RSB Bank cut fra~ments to 2-3" Active 2 access
Sandy and grit Aesthetics of
with small chert campinglboat
ER02-l7Il RSB Bank cut fra~ments to 2-3" Active 2 access
Clay with small
ER02-1712 RSB Bank cut ~ravel Active 4 Disoersed Campin~
Potential to worsen
with use by
Clay with chunks vehicles. major
ER02-l7 I3 RSB Gully of mudstone Active 2 fishin~ site
Potential to worsen
with use by
Clay with chunks vehicles, major
ER02-1714 RSB Gully of mudstone Active 2 fishin~ site
Aesthetics of high-
Clay with chunks use dispersed
ER02-1715 RSB Bank cut of mudstone Active 4 recreation area
Saml with grit and
ER02-1716 RSB Bank cut cobble to 6" Active 4 None
Sand and grit with
ER02-1717 RSB Bank cut lITavelto 4" Active 4 None
Campground sites
STB" River gravels up to are being undercut
ER02-l718 * Bank cut I' boulders Active 4 bv river
ER02-l7l9 RSB Bank cut Clay Bank Active 4 None

Williams rork. Reservoir
Hydroelectric ProjecT
January 2004

S\e\gers Corporation
Erosion Survey Report

APPENDIX ^

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