AZ10308 - Bartlett Dam


Bartlett Dam


	Statistics

General

Vicinity Map

Region (Map) ................ Lower Colorado

State (Map) .................................. Arizona

County ...................................... Maricopa

Project ....................................... Salt River

Dam type ............ Concrete multiple arch

Location .......... 48 mi NE of Phoenix, AZ

Watercourse ......................... Verde River

Reservoir ............................. Bartlett Lake

Original construction .............. 1936-1939

Modified ................................... 1994-1996

Latitude ................................... 33 49´ 5" N

Longitude .......................... 111 37´ 51" W

National ID Number ................. AZ10308

Hydrologic Unit Code .............

Hydraulics

Total storage to
El. 1798 ............................ 178,500 acre-ft

Service spillway
Capacity at El. 1820.2 .......... 284,700 cfs

Auxiliary spillway
Capacity at El. 1820.2 .......... 261,700 cfs

Outlet works
Capacity at El. 1798 ................. 2,600 cfs

Dimensions

Crest Elevation ................................. 1821 ft

Structural Height ............................. 308.5 ft

Hydraulic Height ................................ 188 ft

Crest Length ....................................... 800 ft

Top thickness of arches ....................... 2 ft

Bottom thickness of arches .................. 7 ft

Maximum buttress length ................. 390 ft

Volume of Concrete ............. 182,000 cu yd

Hydrology

Drainage area ............................. 5815 sq mi

Hydrometeorological Report ....... HMR 49

PMF .......................................... 1990 Winter

Volume ....... 2,410,000 acre-ft over 15 days

Peak inflow ................................. 562,000 cfs

Maximum water surface ............... 1820.2 ft

Upstream structures ....... Horseshoe Dam

Dynamic Loads

Natural frequency ............................ 3.1 Hz
(w/ incompressible fluid)

MCE ...................................... M 7.0 at 17 km

Peak acceleration ................................ 0.35g

Geology

Foundation: Fine & course grained granite

Graphics

During construction, November 25, 1938 (90k)
During construction, January 3, 1939 (68k)
Auxiliary spillway construction, December 20, 1994 (90k)
Modification and completed auxiliary spillway, June 22, 1995 (93k)
Modification, December 5, 1995 (91k)

Narration

Bartlett Dam is a reinforced concrete multiple arch and buttress dam. It was constructed between 1936 and 1939. The dam consists of 10 arches, 9 buttresses, and 2 gravity wing dams. The arches are 24-ft radius half cylinders varying in thickness from 7-ft at the base to only 2-ft thick at the crest. The upstream face slopes 42 degrees off vertical. The buttresses are spaced 60 ft center to center. To mitigate a safety of dams issue associated with overtopping due to the probable maximum flood, the dam was raised, the service spillway was modified, and a new auxiliary fuse plug spillway was constructed on the left reservoir rim.

The crest of the dam was raised to El. 1821.0 with a parapet extending up to El. 1824.5. Access across the top of the dam is by way of a walkway cantilevered out from the downstream face of the raised arches. The principal feature of the dam raise is a 2-foot thick wall rising vertically from the existing walkway at El. 1795.5. While this shape required significantly more attention to stresses in the crown of each arch, it resulted in substantial reductions in forming costs.

The gravity wing dams were also raised 21.5 feet to El. 1821.0 and have a 3.5 foot-high parapet wall. The upstream face rises vertically from the upstream edge of the existing walkway to a 3.5 foot wide walkway. The downstream face is sloped 0.7:1, 0.55:1, and 0.5:1, for the right gravity section, left gravity section, and left wing wall respectively. The left gravity section was extended to the south so that the wing wall could be constructed with minimum undercutting of the toppling rock on the left abutment.

The auxiliary spillway is controlled by a fuse plug embankment constructed in three sections separated by concrete walls. The fuse plug is designed to act as a water-retaining structure for floods up to the design events; if those are reached, the fuse plug would wash out in a predictable manner, opening up spillway capacity to prevent overtopping of Bartlett Dam. The first fuse plug section would be overtopped by floods exceeding the 200-year flood. The remaining two sections would fail at successively larger floods. Overtopping begins in a pilot channel constructed at a low elevation on the crest of each section. Erosion of the embankment would then continue laterally in a progressive and controlled manner.

Links

| Recreation | Operating Agency: Salt River Project | 1992 Satellite image of Bartlett Dam |

| Dams Located by State | USBR Arizona Dams | Lower Colorado Region Dams |

| How much water is being released from Bartlett Dam right now? |

| Owner: Bureau of Reclamation, Phoenix Area Office,
PO Box 81169, Phoenix, AZ 85069-1169, (602) 216-3999

| Operator: Salt River Project Agricultural Improvement & Power District,
PO Box 52025, Phoenix, AZ 85072-2025, (602) 236-5900

Contact: DataWeb Team