National Park Service U.S. Department of the Interior Project Overview Reconstruction of Failing Section of El Portal Road East of the Big Oak Flat Intersection Big Oak Flat Road El Portal Road Merced River Pohono Bridge Failing Section Approximate Project Area
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National Park ServiceU.S. Department of the Interior
Project OverviewReconstruction of Failing Section of El Portal Road East of the Big Oak Flat Intersection
Big Oak Flat Road
El Portal Road
Merced River
Pohono Bridge
Failing Section
ApproximateProject Area
National Park ServiceU.S. Department of the Interior
Failing Section
Big Oak Flat Road
El Portal Road
Merced River
Pohono Bridge
Failing Section
ApproximateProject Area
El Portal Road
Merced River
onoPohono Bridgeidge
Big OakFlat Road
Undercut Concrete Barrier at Failing Section
Three of four entrances access Yosemite Valley through this section
This failing section received temporary repairs in 2003
Reconstruction of Failing Section of El Portal Road East of the Big Oak Flat Intersection
Dry Stack Wall at Failing Section (Concrete Barrier)
Merced River
Failed Embankment Area
Embankment Under Cut
Dry Laid Embankment
Undercut at Failing Section
National Park ServiceU.S. Department of the InteriorReconstruction of Failing Section of El Portal
Road East of the Big Oak Flat Intersection
Potential Solutions
Big Oak Flat Road
El Portal Road
Merced River
Pohono Bridge
Failing Section
ApproximateProject Area
Concept 1: River Edge of PavementThis concept holds the existing edge of pavement adjacent to the Merced River and constructs improvements to the north, cutting into the existing cut face.
Concept 2: Cut Wall Edge of PavementThis concept holds the existing edge of pavement adjacent to the existing cut face, and constructs improvements towards the Merced River.
Note: Graphics based on 11 foot travel lanes per Park Road Standards (1984)
Location A Location B
A B
Concept 1 Concept 1
Concept 2 Concept 2
Existing SlopeExisting Wall
Existing SlopeExisting Wall
Existing North Cut Face
Merced River
Existing North Cut Face
Merced River
Existing North Cut Face
Merced River
Existing North Cut Face
Merced River
National Park ServiceU.S. Department of the InteriorReconstruction of Failing Section of El Portal
Road East of the Big Oak Flat Intersection
Potential Solutions
Big Oak Flat Road
El Portal Road
Merced River
Pohono Bridge
Failing Section
ApproximateProject Area
Location A Location B
Concept 3: Cantilever Wall This concept holds the existing edge of pavement adjacent to the existing cut face. The outside of the roadway is supported by a cantilever bridge section, supporting a portion of the roadway over the Merced River.
Concept 4: Base of Existing Slope/WallThis concept holds to the base of the existing slope or wall and minimizes cuts into the existing cut wall where possible.
Note: Graphics based on 11 foot travel lanes per Park Road Standards (1984)
A B
Concept 3 Concept 3
Concept 4 Concept 4
Existing SlopeExisting Wall
Temporary reinforcedexcavation limits to
build cantilever foundation.
Merced River
Existing North Cut Face
Possible excavation limits to retain 1-lane of traffic
Temporary Concrete Barrier
Existing North Cut Face
Merced River
Temporary reinforcedexcavation limits to
build cantilever foundation.
Existing Slope
Existing North Cut Face
Merced River
Existing Wall
Existing North Cut Face
Merced River
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