Hoover Dam Part II

A continuation of yesterpost...

My tour of Hoover Dam started with a short film about the building of the dam. Then I went down an elevator into the dam. The first part of the tour starts in the tunnels dug to divert the Colorado River around the dam site.

Transition from cliff rock to dam concrete

More of the tunnel

Another view

A picture shows the only time that the dam was flooded, with water going over the top of the dam in the 1980s. Even with so much extra water, the dam held.

The dam disappearing

Diagram of the dam and the flow of water

The tour took us to the line of generators on the Nevada side of the dam. The small generator in the lower right below provides electricity for the dam's facilities.

The Nevada generators

The dam's power is produced with a smaller generator--self-sufficiency!

Many of the halls were built with marble and decorations inspired by the project and imitating the Native American art from local tribes. The below symbol shows the strength of the waters. Art Deco was still popular in the 1930s, so the builders had that influence as well.

In the floor

Some of the halls are much more plain and meant only for workers to see.

Maintenance hall

Even those halls have occasional decorations. The drainage grates were eventually filled in since women's high-heeled shoes would get caught in the holes.

Drain that doesn't drain

One of the best parts of the tour is getting to go down a side hall and see one of the "windows" in the face of the dam. The openings provide ventilation for the dam's interior hallways. The tour guide said that in the summer, that ventilation is less than desirable with 100 degree Fahrenheit air coming in.

A small, circular hall

The "window"

View from the window

The circular hall has an access tunnel that goes straight down. I was a little reluctant to step on the grating even though it was clearly secure and safe.

Access going down

The work halls let the employees inspect the dam for cracks or other faults. Most of the cracks that happened were in the first few years as the concrete cured and the dam settled.

Inspection hall

An old-style phone

A system was developed to mark what part of the hall a worker found cracks or other items that needed attention.

40 feet from 0

A crack found in 1934 that didn't get bigger

The dam has earthquake sensors just in case a catastrophic event were to happen. The dam is supposed to withstand mild earthquakes. We were forbidden from touching the sensors.

Earthquake detectors

Just in case the elevators don't work, a set of stairs was installed. They are very steep and have some platforms at certain levels for those who get weary from climbing. The bottom of the stairs is sometimes in water!

The stairs going down

The stairs going up

The concrete blocks were given letters to designate where they changed (and so people wouldn't think a large crack had formed!).

Meeting of Q and P blocks

The tour ends at the top of the dam with a view of the the intake towers.

One of the intake towers

The top of the dam looks down on the river and power generators far below. It gave me the willies!

The river below

View of the river and bridge

The view back to the parking lot is less stressful.

The Nevada side of the dam

The dam creates Lake Mead. When I visited, the water was about sixty feet below where they wanted it. Even so, there is still plenty of water and no worry for power or irrigation.

Lake Mead

The dam has a small building on top of the elevator into the dam.

Near the middle of the bridge

The river is the border between Nevada and Arizona. It's also the line between the Pacific and Mountain Time Zones. A plaque shows the spot so visitors can be in two states and two time zones at the same time.

Plaque commemorating the project

Blogger on both sides of the line

The lake at a lower state

The intake towers provide the water that goes to the turbines on the other side of the dam. Tourists don't get to visit the towers.

Intake towers

The back of the dam

A plaque commemorates Doctor Elwood Mead for whom the lake is named. He was a water and irrigation engineer who worked on the dam project. He died in 1936 so Hoover Dam was his last great project.

Dr. Mead

Another display commemorates those who died during the construction of the dam. The tour guide said that no one is buried in the dam, contrary to popular belief.

Memorial to those who died on the project

Nearby is a commemoration of completion of the project. Two angels overlook a display showing where the stars and planets were in the sky when they dedicated the project in 1935. That way if future people or aliens (the outer space kind) visit they can calculate when the dam was built. It struck me as a bit egotistical.

Angels overlooking the dam

Part of the star chart

The base of the memorial

The various states involved in the project are also part of the Colorado River system.

Arizona, Nevada...

...New Mexico, Wyoming, Colorado...

...California, and Utah

The Hoover Dam is an amazing achievement and a spectacular site to visit.

Hoover Dam Part I

On my last day in Las Vegas I drove out to Hoover Dam which is less than an hour away. The project began in the 1930s, during the Great Depression. The Colorado River often flooded, causing havoc for farmers and others. Southern California was badly in need of water. Creating a controllable source (like a reservoir behind a dam) was a viable solution. The dam would provide hydroelectric power to the region. The project also also provided jobs and a sense of accomplishment to a country suffering under economic ravages.

The Colorado River's Black Canyon was selected among several sites as easier than others. Even so, the project required a lot of infrastructure. Roads were built into the area and Boulder City was created to house the workers. The first part of the project was to divert the river around the site. Four large tunnels were dug through the cliff sides to channel the water downriver. With the water clear, the rocks and detritus on the riverbed were taken out. Concrete began pouring and continued constantly for two years. The project was planned down to the last detail and was completed two years ahead of schedule. President  Franklin Roosevelt dedicated it in 1935 as Boulder Dam. The project was authorized under Herbert Hoover's administration and eventually the name was changed to honor the thirty-first president.

The dam has been in continual use since opening. The builders also planned for tours of the dam by adding in marble and fancy decorations in certain sections. The tours have been ongoing since the dam opened in the 1930s. I took one of the tours and saw the museum and the insides of the dam.

The Welcome sign

Approach to the dam from the parking lot

After buying a ticket (I spent extra for the inside tour), I had a wait till the dam tour started, so I went through the museum. The museum tells the whole story of the dam from its construction to the science of hydroelectricity and the impact on the area.

One display showed the various reactions to the announcement of the project. Some were skeptical of the government spending so much money on the project (though it has more than paid for itself). Farmers and residents of the area wanted the water and the prosperity the project promised.

Various opinions on whether to build or not

Choosing the site was a long and laborious process. Black Canyon was chosen because it wasn't too far from resources like sand and gravel (for the concrete) and the point was more narrow and had better bedrock for the dam.

Where to make the dam

Construction began with blasting and digging out the tunnels to divert the river. Once the water was out of the way, the workers started pouring tons of concrete around the clock for two years.

Blasting powder and other tools of the trade

Recreation of the concrete bins used for the dam

Map of the river diversion and dam project

A model shows how the dam was built block by block. Each block had pipes inside of it so that water would cool the concrete and make it set faster. If they hadn't done that, the concrete would still be curing today!

Building up the dam

The displays show how the hydroelectric generators work. Each side of the dam has several generators, with seventeen in total.

Using magnets to make electricity

The museum has an observation area where I took my first picture with the dam.

The dam and I

Originally, the dam was used as a roadway across the Colorado River from Arizona to Nevada. Now, access to the dam is only on the Nevada side though people are allowed to drive across the top of the dam to the parking on the Arizona side. There's no exit on the Arizona side so I didn't bother diving my brother's car across the dam just to drive across the dam. A new bridge was built not far from the dam.

Cars on the dam

Colorado River under the dam

The power plants are just under the dam.

Power plants

Blogger with bridge in background

Another display shows how the energy flows from the dam to people's homes.

The path of power

Yet another display shows art inspired by the Native Americans of the area. Several large sculptures depict the industry and the resources used and produced by the dam.

A bit of art

The original museum for the dam is located on the Nevada side.

Original (and smaller) museum

Inside the old museum, a bust commemorates Herbert Hoover.

Hoover remembered

A display shows the various projects (i.e. other dams) created by the Bureau of Reclamation. Plenty of dams provide electricity for the western United States.

Dam map

The main display is a forty-foot diorama showing the Colorado River and the various dams built along it.

Diorama

Lake Mead (created by Hoover Dam)

A less complicated dam

Hoover Dam

The gift shop/cafeteria has a statue of the high scalers who removed the loose rocks from the canyon walls, thus making the site a safer place to work.

High scaler

In the next post, my tour of the dam starts!