US Bridges

IRR BIA RTE N6486 over Laguna Creek

Fair

Navajo County, Arizona · 3 MI West of Kayenta · Structure no. 00000000000N308

Built
1973
52 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
66 ft
2 main spans
Daily traffic
411
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N6486 over Laguna Creek is a steel stringer/multi-beam or girder carrying IRR BIA RTE N6486 over Laguna Creek in Navajo County, Arizona. It was built in 1973, so it is 52 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 411 vehicles a day, roughly 3% of them trucks, projected to reach 527 by 2043. The structure is 66 ft (20 m) long and 12 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesIRR BIA RTE N6486
CrossesLaguna Creek
Location3 MI West of Kayenta
RouteFederal Lands Road N6486
CountyNavajo County
StateArizona
Coordinates36.726, -110.30858
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating49.3 US tons
Inventory rating35.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOpen grating
Main spans2
Design loadUnknown
Structure length66 ft (20 m)
Longest span32 ft (9.7 m)
Deck width12 ft (3.7 m)
Roadway width11 ft (3.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic411 (2023)
Projected traffic527 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$600,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE N6486 over Laguna Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is IRR BIA RTE N6486 over Laguna 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 March 2023.

How much traffic does IRR BIA RTE N6486 over Laguna Creek carry?

About 411 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is IRR BIA RTE N6486 over Laguna Creek?

The structure is 66 ft (20 m) long with a longest span of 32 ft (9.7 m) and a deck 12 ft wide.

Who owns IRR BIA RTE N6486 over Laguna Creek?

It is owned by the Bureau of Indian Affairs.