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Robert B. Griffith Water Project - Main Page
Facilities in Operation - First Stage
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Storage Dams |
1 |
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Main Aqueduct |
2.97 mi |
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River Mountain Tunnel |
4 mi |
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Laterals |
32.1 mi |
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Pumping Plants |
9 |
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Facilities in Operation - Second Stage
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Main Aqueduct "B" Line |
2.39 mi |
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Pittman Lateral |
19.79 mi |
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Pumping Plants |
6 |
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Storage Facilities
Hoover Dam
Carriage Facilities - First Stage
Saddle Island Intake Facilities and Tunnel
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Location |
Extends from the east side of Saddle Island in Lake Mead though the island to the west, and terminates in a pump chamber below Pumping Plant No.1. |
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Construction period |
1969-1971 |
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Length |
0.27 mi |
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Capacity1 |
623 cfs |
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Cross section: |
Horseshoe |
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Diameter |
156 in |
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Elevation of inlet |
1,018.1 ft |
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Lining: |
Generally unlined |
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Access adit: |
Provides access to the intake tunnel and pumping plant chamber through an inclined tunnel. |
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Length |
1,400 ft |
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Width |
14 ft |
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Type: |
Modified horseshoe |
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Slope |
0.17 |
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1 The tunnel was designed to provide capacity for both first and second stage operation |
Main Aqueduct
|
Location |
Extends from Pumping Plant No.1 to the River Mountain Tunnel. |
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Construction period |
1970-1971 |
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Description |
Prestressed circular concrete |
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Length |
2.97 mi |
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Diameter |
120-96 in |
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Capacity |
585-300 cfs |
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River Mountain Tunnel
|
Location |
Excavated through the River Mountains, which lie between Las Vegas Valley and Lake Mead. |
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Construction period |
1968-1970 |
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Length |
3.78 mi |
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Diversion capacity |
500-608 cfs |
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Cross section: |
Circular |
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Diameter |
121.5-156 in |
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Lining: |
Concrete |
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Thickness |
15-21 in |
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Las Vegas Valley Lateral
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Location |
Begins at the outlet portal of the River Mountain Tunnel and runs to the Whitney Bifurcation |
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Construction period |
1970-1971 |
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Description |
Cylindrical |
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Prestressed concrete pipe |
3.08 mi |
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Steel pipe, mortar lined |
3.38 mi |
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Steel pipe, coal-tar coated |
0.53 mi |
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Total length: |
6.99 mi |
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River Mountain Tunnel to
Henderson Bifurcation |
0.97 mi |
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Henderson Bifurcation to
Whitney Bifurcation |
6.02 mi |
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Diameter |
96-90 in |
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Initial capacity |
289-261 cfs |
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North Las Vegas Lateral
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Location |
Begins at the Whitney Bifurcation and extends to a terminal reservoir near Nellis Air Force Base. |
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Construction period |
1970-1971 |
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Description |
. |
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Steel pipe, coal-tar coated |
0.21 mi |
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Steel pipe, mortar lined |
8.42 mi |
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Pretensioned concrete |
1.37 mi |
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Length |
10 mi |
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Diameter |
72-24 in |
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Capacity |
101-16 cfs |
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Whitney Lateral
|
Location |
Begins at the Whitney Bifurcation and extends in an easterly direction to a terminal reservoir near the intersection of Flamingo Road and Pecos Road. |
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Construction period |
1970-1971 |
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Description |
|
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Steel pipe, coal-tar coated |
1.63 mi |
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Steel pipe, mortar lined |
1.65 mi |
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Length |
3.28 mi |
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Diameter |
66 in |
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Capacity |
160 cfs |
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Sahara Lateral
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Location |
Begins at Sahara Bifurcation and extends eastward to the Sahara Flow Control Station. |
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Construction period |
1970-1971 |
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Description |
Steel pipe, mortar lined and coated |
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Length |
0.34 mi |
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Diameter |
24 in |
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Capacity |
15 cfs |
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Henderson Lateral
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Location |
Begins at the Henderson Bifurcation works in the Las Vegas Valley Lateral and extends in a south westerly direction to the city of Henderson terminal tank. |
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Construction period |
1968-1971 |
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Description |
Steel pipe, mortar lined and coated |
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Length |
4.53 mi |
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Diameter |
36 in |
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Capacity |
28 cfs |
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Boulder City Lateral
|
Location |
Begins at Pumping Plant No.1A and terminates at the twin receiving tanks near Boulder City, Nevada. |
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Construction period |
1968-1969 |
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Description |
Pretensioned concrete and steel-lined pipe. |
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Length |
7.48 mi |
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Diameter |
36-27 in |
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Capacity |
30 cfs |
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Alfred Merritt Smith Water Treatment Facilities
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Location |
Constructed by the State of Nevada near Pumping Plant 1A near the west shore of Lake Mead opposite Saddle Island. |
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Construction period |
1968-1970 |
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Description |
The water treatment plant provides for pretreatment, aeration, taste and color control, flocculation, filtration, chlorination, and corrosion control. |
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Capacity |
34.5 MGD |
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Number of Flocculation units |
10 |
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Number of filters |
20 |
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Surface area of filters |
56,000 ft2 |
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Filter rating at maximum flow |
5 ft2 |
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Filter mediator |
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Anthracite coal |
20 in |
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Sand |
10 in |
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Filter backwash rate |
22.5 cfs |
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Chemical additives: |
Chlorine, sulfur dioxide, potassium permanganate, sodium silicate, activated silica, caustic soda, aluminum sulfate, activated carbon, and polyelectrolyte. |
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Carriage Facilities - Second Stage
Main Aqueduct "B" line
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Location |
Runs from Pumping Plant 1B to the River Mountains Tunnel. |
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Construction period |
1977-1979 |
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Description |
Prestressed circular concrete |
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Length |
2.39 mi |
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Diameter |
96-108 in |
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Capacity |
306 cfs |
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Pittman Lateral
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Location |
Begins at the outlet portal of the River Mountains Tunnel and extends to Oakey Blvd. |
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Construction period |
1978-1981 |
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Description |
|
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River Mountain Tunnel portal to
Mesa Lateral Bifurcation |
6.57 mi of 8.5-ft-diameter steel pipe with Pritec coating and field applied mortar lining |
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Mesa Lateral Bifurcation to
Valley View Regulating Tank |
9.59 mi of 7.5- and 8.0-ft-diameter steel pipe with Pritec coating and field applied mortar lining |
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Valley View Regulating Tank
to Oakey Turnout |
3.63 mi of 7.0-ft-diameter reinforced concrete pipe. |
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Length |
19.79 mi |
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Diameter |
102-84 in |
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Capacity |
232-319 cfs |
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Fayle Lateral
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Location |
From Valley View Regulating Tank to Fayle Reservoir. |
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Construction period |
1980 |
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Description |
Steel pipe with Pritec coating and field applied mortar lining. |
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Length |
0.34 mi |
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Diameter |
72 in |
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Capacity |
140 cfs |
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Twin Lakes Lateral
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Location |
Begins at the Oakey Turnout, the end of Pittman Lateral, and extends to Carlton Square Reservoir. |
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Construction period |
1981-1982 |
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Description |
Pretensioned concrete cylinder pipe |
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Length |
5.36 mi |
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Diameter |
33, 36, 42, 48 in |
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Capacity |
32-82 cfs |
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Foothill Lateral
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Location |
Begins at Foothill Turnout on Pittman Lateral, and extends to Foothill Tank (constructed by City of Henderson) |
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Construction period |
1981 |
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Description |
Asbestos-cement pressure pipe |
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Length |
0.20 mi |
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Diameter |
21 in |
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Capacity |
12 cfs |
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North Lateral
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Location |
Begins at North Lateral Turnout on Pittman Lateral and extends to a reservoir constructed by the City of Henderson at a site near the city's north boundary. |
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Construction period |
1980-1981 |
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Description |
Asbestos-concrete pressure pipe and steel coal-tar enameled coated pipe. |
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Length |
0.58 mi |
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Diameter |
24 in |
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Capacity |
11 cfs |
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Mesa Lateral
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Location |
Begins at Mesa Lateral Bifurcation on Pittman Lateral and runs to receiving tank built by the city of Henderson. |
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Construction period |
1980-1982 |
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Description |
Pretensioned concrete cylinder pipe and steel coal-tar enameled coated pipe. |
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Length |
2.17 mi |
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Diameter |
42 in |
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Capacity |
46 cfs |
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Charleston Heights Lateral
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Location |
Starts at a bifurcation on Twin Lakes Lateral and terminates at Las Vegas Valley Water District tanks. |
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Construction period |
1981-1982 |
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Description |
Pretensioned concrete cylinder pipe and steel coal-tar enameled coated pipe. |
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Length |
0.14 mi |
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Diameter |
42 in |
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Capacity |
40 cfs |
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Robinson Lateral
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Location |
Begins at the Twin Lakes Pumping Plant and Forebay and extends to an existing North Las Vegas water tank located in the vicinity of the North Las Vegas Air Terminal. |
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Construction period |
1981-1982 |
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Description |
Asbestos-cement pressure pipe |
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Length |
1.52 mi |
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Diameter |
24 in |
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Capacity |
10 cfs |
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Colorado Street Lateral
|
Location |
Extends from Pumping Plant No. 7B near first stage Pumping Plant No. 7 to Boulder City's existing west water tank. |
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Construction period |
1981-1982 |
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Description |
Pretensioned concrete cylinder pipe |
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Length |
0.52 mi |
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Diameter |
18, 21, 27 in |
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Capacity |
7.5 cfs |
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Hemenway Lateral
|
Location |
On the Boulder City Lateral about 2,500 feet before lateral reaches Surge Tank No. 5. |
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Construction period |
1981-1982 |
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Description |
Asbestos-cement pressure pipe and steel pipe with Pritec coating and mortar lining. |
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Length |
0.12 mi |
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Diameter |
8-12 in |
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Capacity |
2.5 cfs |
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Pumping Plants
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Designation |
Number of units |
Total capacity, cfs |
Total dynamic head, ft |
Total horsepower |
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First Stage |
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Pumping Plant No. 1 |
10-0 sb |
311 |
223 |
10,000 |
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PP No. 1A - Main Aqueduct |
6-1 sb |
300 |
355 |
15,000 |
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PP No. 1A - Boulder City
Lateral |
2-1 sb |
15 |
455 |
12,000 |
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No. 2A |
6-1 sb |
300 |
355 |
15,000 |
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No. 3 |
3-1 sb |
28 |
230 |
1,050 |
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No. 4 |
2-1 sb |
15 |
455 |
1,200 |
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No. 5 |
2-1 sb |
15 |
455 |
1,200 |
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No. 6 |
3-1 sb |
90 |
182 |
2,400 |
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No. 7 |
3-1 sb |
15 |
78 |
225 |
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Second Stage |
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PP No. 1 (modifications) |
10-0 sb |
312 |
223 |
10,000 |
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PP No.1A - Boulder City
Lateral (modifications) |
2-0 sb |
15 |
445 |
1,200 |
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PP No. 4 (modifications) |
2-0 sb |
15 |
445 |
1,200 |
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PP No. 5 (modifications) |
2-0 sb |
15 |
445 |
1,200 |
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PP No. 1B |
6-1 sb |
306 |
355 |
18,000 |
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PP No. 2B |
6-1 sb |
306 |
355 |
18,000 |
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PP No. 7B |
3-1 sb |
7.5 |
175 |
225 |
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Hacienda |
6-1 sb |
250 |
365 |
18,000 |
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Twin Lakes - Robinson |
3-1 sb |
10 |
102 |
180 |
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Twin Lakes - Carlton |
3-1 sb |
32 |
117 |
600 |
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Power Facilities
Robert B. Griffith Water Project - First Stage
Robert B. Griffith Water Project - Second Stage
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