US Bridges

Dam Crest Road over Arizona Spillway Channel

Good

Mohave County, Arizona · .20 East of Hoover Dam · Structure no. 0305-3003

Built
1934
91 years old
Condition
Good
inspected October 2024
Type
Arch - Deck
Concrete
Length
124 ft
1 main span
Daily traffic
1,000
2012 count
Owner
Federal
Bureau of Reclamation

About this bridge

Dam Crest Road over Arizona Spillway Channel is a concrete arch - deck carrying Dam Crest Road over Arizona Spillway Channel in Mohave County, Arizona. It was built in 1934, so it is 91 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,000 vehicles a day, projected to reach 1,500 by 2035. The structure is 124 ft (37.7 m) long and 47 ft wide.

Location

Open in Google Maps
CarriesDam Crest Road
CrossesArizona Spillway Channel
Location.20 East of Hoover Dam
RouteFederal Lands Road 0
CountyMohave County
StateArizona
Coordinates36.01364, -114.7357
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.5 US tons
Inventory rating34.6 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length124 ft (37.7 m)
Longest span121 ft (36.9 m)
Deck width47 ft (14.3 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2012)
Projected traffic1,500 by 2035
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Reclamation
Maintained byBureau of Reclamation
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Dam Crest Road over Arizona Spillway Channel built?

It was built in 1934, making it 91 years old in 2025.

What condition is Dam Crest Road over Arizona Spillway Channel in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Dam Crest Road over Arizona Spillway Channel carry?

About 1,000 vehicles per day (2012 count).

How long is Dam Crest Road over Arizona Spillway Channel?

The structure is 124 ft (37.7 m) long with a longest span of 121 ft (36.9 m) and a deck 47 ft wide.

Who owns Dam Crest Road over Arizona Spillway Channel?

It is owned by the Bureau of Reclamation.