US Bridges

Alkali Creek Rd. over Alkali Creek

Good

Yellowstone County, Montana · 1M N Billings · Structure no. 000000202104974

Built
2021
4 years old
Condition
Good
inspected October 2023
Type
Tee Beam
Prestressed Concrete
Length
97 ft
1 main span
Daily traffic
484
2023 count
Owner
County
County Highway Agency

About this bridge

Alkali Creek Rd. over Alkali Creek is a prestressed concrete tee beam carrying Alkali Creek Rd. over Alkali Creek in Yellowstone County, Montana. It was built in 2021, so it is 4 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 484 vehicles a day, roughly 2% of them trucks, projected to reach 515 by 2043. The structure is 97 ft (29.6 m) long and 37 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesAlkali Creek Rd.
CrossesAlkali Creek
Location1M N Billings
StateMontana
Coordinates45.81952, -108.52707
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29 US tons
Inventory rating17 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length97 ft (29.6 m)
Longest span93 ft (28.3 m)
Deck width37 ft (11.4 m)
Roadway width27 ft (8.2 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 closed123.7 mi (199 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 built?

It was built in 2021, making it 4 years old in 2025.

What condition is Alkali Creek Rd. over Alkali Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Alkali Creek Rd. over Alkali Creek carry?

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

How long is Alkali Creek Rd. over Alkali Creek?

The structure is 97 ft (29.6 m) long with a longest span of 93 ft (28.3 m) and a deck 37 ft wide.

Who owns Alkali Creek Rd. over Alkali Creek?

It is owned by the County Highway Agency.