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MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Near Page in Coconino County, Arizona — The American Mountains (Southwest)
 

Rock Bolts / High Scaling

Reclamation: Managing Water in the West

 
 
Rock Bolts / High Scaling Marker image. Click for full size.
By William Fischer, Jr., November 13, 2010
1. Rock Bolts / High Scaling Marker
Inscription.
Rock Bolts
Since Navajo sandstone tends to fracture vertically, rock bolts lock rock slabs together, thereby minimizing rock falls into the canyon. These bolts extend from 45 to 75 feet (14-23 meters) into the canyon wall. They are assembled in 10 foot (3 meter) sections. An expansion device on the end ties the bolt solidly to the wall. The plate is 14 inches (36 centimeters) square and 2 inches (5 centimeters) thick. The bolts are cement grouted into the wall.

High Scaling
High scalers of the past are now highly trained rope access technicians. Some of the work is similar, installing chain mesh and installing and checking rock bolts. Other work is more technical, including performing inspections of the dam and abutments, spillway tunnels, penstocks, and outlet pipes.
 
Erected by Bureau of Reclamation.
 
Location. 36° 56.204′ N, 111° 29.17′ W. Marker is near Page, Arizona, in Coconino County. Click for map. Marker is on top of the Glen Canyon Dam, off US Route 89 at the Colorado River. Marker is in this post office area: Page AZ 86040, United States of America.
 
Other nearby markers. At least 8 other markers are within walking distance of this marker. Hydroelectric Power - A Green and Renewable Energy Source (here, next to this
Rock Bolts / High Scaling Marker image. Click for full size.
By William Fischer, Jr., November 13, 2010
2. Rock Bolts / High Scaling Marker
On top of Glen Canyon Dam
marker); Concrete Bucket / Concrete Core Sample (within shouting distance of this marker); Intake Structures (within shouting distance of this marker); Turbine Runner (about 300 feet away, measured in a direct line); Colorado River Storage Project / Glen Canyon Dam (about 400 feet away); Bureau of Reclamation Memorial Fountain (about 400 feet away); Dinosaur Tracks (about 400 feet away); Glen Canyon Dam (about 400 feet away). Click for a list of all markers in Page.
 
Also see . . .
1. Glen Canyon Dam. (Submitted on February 17, 2011, by William Fischer, Jr. of Scranton, Pennsylvania.)
2. Glen Canyon National Recreation Area. (Submitted on February 17, 2011, by William Fischer, Jr. of Scranton, Pennsylvania.)
3. How Rock Bolts Work. (Submitted on February 17, 2011, by William Fischer, Jr. of Scranton, Pennsylvania.)
 
Categories. Charity & Public WorkIndustry & CommerceMan-Made FeaturesWaterways & Vessels
 
Rock Bolt and Marker image. Click for full size.
By William Fischer, Jr., November 13, 2010
3. Rock Bolt and Marker
Rock Bolts and Mesh Along West Canyon Wall image. Click for full size.
By William Fischer, Jr., November 13, 2010
4. Rock Bolts and Mesh Along West Canyon Wall
Photo on Rock Bolts / High Scaling Marker image. Click for full size.
By Bureau of Reclamation, May 1960
5. Photo on Rock Bolts / High Scaling Marker
[Caption reads] High scalers work above the turbulent Colorado River [one of several historical photos on the marker]
 
 
Credits. This page originally submitted on , by William Fischer, Jr. of Scranton, Pennsylvania. This page has been viewed 1,034 times since then and 3 times this year. Photos:   1, 2, 3, 4, 5. submitted on , by William Fischer, Jr. of Scranton, Pennsylvania. This page was last revised on June 16, 2016.
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