US Bridges

IRR BIA RTE 18 over Xi Wash

Fair

Coconino County, Arizona · 40.6 KM NE Peach Springs · Structure no. 0000H68606B0233

Built
1980
45 years old
Condition
Fair
inspected December 2024
Type
Culvert
Steel
Length
38 ft
3 main spans
Daily traffic
100
2024 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 18 over Xi Wash is a steel culvert carrying IRR BIA RTE 18 over Xi Wash in Coconino County, Arizona. It was built in 1980, so it is 45 years old, younger 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 10% of them trucks, projected to reach 120 by 2044. The structure is 38 ft (11.5 m) long and 28 ft wide. If it were closed, the detour would be 102.5 mi (165 km).

Location

Open in Google Maps
CarriesIRR BIA RTE 18
CrossesXi Wash
Location40.6 KM NE Peach Springs
RouteFederal Lands Road 18
CountyCoconino County
StateArizona
Coordinates35.76586, -113.08381
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length38 ft (11.5 m)
Longest span9 ft (2.8 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2024)
Projected traffic120 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed102.5 mi (165 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 18 over Xi Wash built?

It was built in 1980, making it 45 years old in 2025.

What condition is IRR BIA RTE 18 over Xi Wash 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 December 2024.

How much traffic does IRR BIA RTE 18 over Xi Wash carry?

About 100 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is IRR BIA RTE 18 over Xi Wash?

The structure is 38 ft (11.5 m) long with a longest span of 9 ft (2.8 m) and a deck 28 ft wide.

Who owns IRR BIA RTE 18 over Xi Wash?

It is owned by the Bureau of Indian Affairs.