US Bridges

IRR BIA RTE N6486 over Laguna Creek

Poor

Navajo County, Arizona · 3 MI East of Tsegi · Structure no. 00000000000N314

Built
1965
60 years old, rebuilt 1976
Condition
Poor
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
34 ft
1 main span
Daily traffic
150
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 1965 and reconstructed in 1976, so it is 60 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 2 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 150 vehicles a day, roughly 3% of them trucks, projected to reach 176 by 2043. The structure is 34 ft (10.4 m) long and 12 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesIRR BIA RTE N6486
CrossesLaguna Creek
Location3 MI East of Tsegi
RouteFederal Lands Road N6486
StateArizona
Coordinates36.68278, -110.40055
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; extensive scour has occurred
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating37.7 US tons
Inventory rating22.6 US tons

Structure

MaterialSteel
DeckOpen grating
Main spans1
Design loadUnknown
Structure length34 ft (10.4 m)
Longest span30 ft (9.2 m)
Deck width12 ft (3.7 m)
Roadway width10 ft (3.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2023)
Projected traffic176 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$650,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE N6486 over Laguna Creek built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1976.

What condition is IRR BIA RTE N6486 over Laguna Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

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

About 150 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is IRR BIA RTE N6486 over Laguna Creek?

The structure is 34 ft (10.4 m) long with a longest span of 30 ft (9.2 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.