Near Page in Coconino County, Arizona — The American Mountains (Southwest)
Rock Bolts / High Scaling
Reclamation: Managing Water in the West
Photographed By William Fischer, Jr., November 13, 2010
1. Rock Bolts / High Scaling Marker
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.
Topics. This historical marker is listed in these topic lists: Architecture • Charity & Public Work • Industry & Commerce • Waterways & Vessels.
Location. 36° 56.204′
this page online
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 marker); Wicket Gates (within shouting distance of this 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). Touch for a list and map of all markers in Page.
Also see . . . Glen Canyon National Recreation Area. (Submitted on February 17, 2011, by William Fischer, Jr. of Scranton, Pennsylvania.)
Photographed By William Fischer, Jr., November 13, 2010
2. Rock Bolts / High Scaling Marker
On top of Glen Canyon Dam
Photographed By William Fischer, Jr., November 13, 2010
3. Rock Bolt and Marker
Photographed By William Fischer, Jr., November 13, 2010
4. Rock Bolts and Mesh Along West Canyon Wall
Photographed 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 was last revised on August 29, 2020. It was originally submitted on February 17, 2011, by William Fischer, Jr. of Scranton, Pennsylvania. This page has been viewed 1,243 times since then and 17 times this year. Photos: 1, 2, 3, 4, 5. submitted on February 17, 2011, by William Fischer, Jr. of Scranton, Pennsylvania.
