US Bridges

IRR BIA Route 1 over Tyson Waterway

FairPosted for load

La Paz County, Arizona · 1.6 KM S of BIA 1/56 Int. · Structure no. 00000000000H008

Built
1958
67 years old
Condition
Fair
inspected April 2019
Type
Slab
Concrete Continuous
Length
93 ft
3 main spans
Daily traffic
1,700
2019 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA Route 1 over Tyson Waterway is a concrete continuous slab carrying IRR BIA Route 1 over Tyson Waterway in La Paz County, Arizona. It was built in 1958, so it is 67 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. Its operating status is: posted for load restriction.

It carries about 1,700 vehicles a day, roughly 15% of them trucks, projected to reach 2,000 by 2039. The structure is 93 ft (28.4 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesIRR BIA Route 1
CrossesTyson Waterway
Location1.6 KM S of BIA 1/56 Int.
RouteFederal Lands Road 1
CountyLa Paz County
StateArizona
Coordinates33.75161, -114.4686
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2019
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating24.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length93 ft (28.4 m)
Longest span30 ft (9.1 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2019)
Projected traffic2,000 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$2 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA Route 1 over Tyson Waterway built?

It was built in 1958, making it 67 years old in 2025.

What condition is IRR BIA Route 1 over Tyson Waterway 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 April 2019.

How much traffic does IRR BIA Route 1 over Tyson Waterway carry?

About 1,700 vehicles per day (2019 count), of which roughly 15% are trucks.

How long is IRR BIA Route 1 over Tyson Waterway?

The structure is 93 ft (28.4 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.

Who owns IRR BIA Route 1 over Tyson Waterway?

It is owned by the Bureau of Indian Affairs.