US Bridges

Alkali Creek RD over Alkali Creek 034

Fair

Yellowstone County, Montana · 2M NW Billings · Structure no. L56726001+07001

Built
1989
36 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
37 ft
1 main span
Daily traffic
484
2023 count
Owner
County
County Highway Agency

About this bridge

Alkali Creek RD over Alkali Creek 034 is a steel stringer/multi-beam or girder carrying Alkali Creek RD over Alkali Creek 034 in Yellowstone County, Montana. It was built in 1989, so it is 36 years old, younger 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 37 ft (11.3 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesAlkali Creek RD
CrossesAlkali Creek 034
Location2M NW Billings
RouteCounty Highway 56726
CountyYellowstone County
StateMontana
Coordinates45.82523, -108.53574
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating27.1 US tons
Inventory rating16.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length37 ft (11.3 m)
Longest span33 ft (10.1 m)
Deck width31 ft (9.3 m)
Roadway width29 ft (8.7 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 closed3.1 mi (5 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 034 built?

It was built in 1989, making it 36 years old in 2025.

What condition is Alkali Creek RD over Alkali Creek 034 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 May 2023.

How much traffic does Alkali Creek RD over Alkali Creek 034 carry?

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

How long is Alkali Creek RD over Alkali Creek 034?

The structure is 37 ft (11.3 m) long with a longest span of 33 ft (10.1 m) and a deck 31 ft wide.

Who owns Alkali Creek RD over Alkali Creek 034?

It is owned by the County Highway Agency.