US Bridges

IRR BIA RTE 55 over Fire Box Creek

Fair

Navajo County, Arizona · 9.6 KM E of White River · Structure no. 00000000000H096

Built
1974
51 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
100
2021 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 55 over Fire Box Creek is a concrete culvert carrying IRR BIA RTE 55 over Fire Box Creek in Navajo County, Arizona. It was built in 1974, so it is 51 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 6 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 100 vehicles a day, roughly 2% of them trucks, projected to reach 120 by 2038. The structure is 21 ft (6.4 m) long and 72 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesIRR BIA RTE 55
CrossesFire Box Creek
Location9.6 KM E of White River
RouteFederal Lands Road 55
StateArizona
Coordinates33.8285, -109.86353
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3.1 m)
Deck width72 ft (21.9 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2021)
Projected traffic120 by 2038
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE 55 over Fire Box Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is IRR BIA RTE 55 over Fire Box Creek 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 February 2024.

How much traffic does IRR BIA RTE 55 over Fire Box Creek carry?

About 100 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is IRR BIA RTE 55 over Fire Box Creek?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3.1 m) and a deck 72 ft wide.

Who owns IRR BIA RTE 55 over Fire Box Creek?

It is owned by the Bureau of Indian Affairs.