US Bridges

Alkali Creek RD over Alkali Creek 053

Fair

Yellowstone County, Montana · 4M NW Billings · Structure no. L56726004+01001

Built
1969
56 years old
Condition
Fair
inspected August 2024
Type
Channel Beam
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
484
2023 count
Owner
County
County Highway Agency

About this bridge

Alkali Creek RD over Alkali Creek 053 is a prestressed concrete channel beam carrying Alkali Creek RD over Alkali Creek 053 in Yellowstone County, Montana. It was built in 1969, so it is 56 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 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 484 vehicles a day, roughly 2% of them trucks, projected to reach 515 by 2043. The structure is 24 ft (7.3 m) long and 25 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

CarriesAlkali Creek RD
CrossesAlkali Creek 053
Location4M NW Billings
RouteCounty Highway 56726
StateMontana
Coordinates45.84464, -108.56948
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic484 (2023)
Projected traffic515 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
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 Alkali Creek RD over Alkali Creek 053 built?

It was built in 1969, making it 56 years old in 2025.

What condition is Alkali Creek RD over Alkali Creek 053 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 August 2024.

How much traffic does Alkali Creek RD over Alkali Creek 053 carry?

About 484 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Alkali Creek RD over Alkali Creek 053?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 25 ft wide.

Who owns Alkali Creek RD over Alkali Creek 053?

It is owned by the County Highway Agency.