US Bridges

Fort Rock Road over I-40

Fair

Mohave County, Arizona · 19.6 MI E JCT US 93 · Structure no. 01771

Built
1975
50 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
245 ft
2 main spans
Daily traffic
110
2020 count
Owner
State
State Highway Agency

About this bridge

Fort Rock Road over I-40 is a concrete continuous box beam or girders - single or spread carrying Fort Rock Road over I-40 in Mohave County, Arizona. It was built in 1975, so it is 50 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 110 vehicles a day, roughly 1% of them trucks, projected to reach 120 by 2040. The structure is 245 ft (74.7 m) long and 29 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesFort Rock Road
CrossesI-40
Location19.6 MI E JCT US 93
RouteCounty Highway 0
CountyMohave County
StateArizona
Coordinates35.1905, -113.3652
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length245 ft (74.7 m)
Longest span122 ft (37.2 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2020)
Projected traffic120 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Fort Rock Road over I-40 built?

It was built in 1975, making it 50 years old in 2025.

What condition is Fort Rock Road over I-40 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.

How much traffic does Fort Rock Road over I-40 carry?

About 110 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Fort Rock Road over I-40?

The structure is 245 ft (74.7 m) long with a longest span of 122 ft (37.2 m) and a deck 29 ft wide.

Who owns Fort Rock Road over I-40?

It is owned by the State Highway Agency.