US Bridges

IRR BIA RTE 16 over Lodge Grass Creek

Fair

Big Horn County, Montana · At Lodge Grass · Structure no. 00000000000C203

Built
1962
63 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
60 ft
3 main spans
Daily traffic
300
2024 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 16 over Lodge Grass Creek is a concrete continuous slab carrying IRR BIA RTE 16 over Lodge Grass Creek in Big Horn County, Montana. It was built in 1962, so it is 63 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 300 vehicles a day, roughly 15% of them trucks, projected to reach 351 by 2042. The structure is 60 ft (18.2 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIRR BIA RTE 16
CrossesLodge Grass Creek
LocationAt Lodge Grass
RouteFederal Lands Road 16
StateMontana
Coordinates45.30941, -107.36849
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating24 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length60 ft (18.2 m)
Longest span22 ft (6.7 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2024)
Projected traffic351 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 16 over Lodge Grass Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is IRR BIA RTE 16 over Lodge Grass 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 June 2024.

How much traffic does IRR BIA RTE 16 over Lodge Grass Creek carry?

About 300 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is IRR BIA RTE 16 over Lodge Grass Creek?

The structure is 60 ft (18.2 m) long with a longest span of 22 ft (6.7 m) and a deck 27 ft wide.

Who owns IRR BIA RTE 16 over Lodge Grass Creek?

It is owned by the Bureau of Indian Affairs.