US Bridges

S Frontage RD over Hogan`s Slough

Fair

Yellowstone County, Montana · Billings-S Frontage RD · Structure no. U01011000+09321

Built
1958
67 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
84 ft
2 main spans
Daily traffic
2,349
2023 count
Owner
State
State Highway Agency

About this bridge

S Frontage RD over Hogan`s Slough is a prestressed concrete stringer/multi-beam or girder carrying S Frontage RD over Hogan`s Slough in Yellowstone County, Montana. It was built in 1958, so it is 67 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 2,349 vehicles a day, roughly 3% of them trucks, projected to reach 2,466 by 2043. The structure is 84 ft (25.6 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesS Frontage RD
CrossesHogan`s Slough
LocationBillings-S Frontage RD
RouteCity Street 1011
CountyYellowstone County
StateMontana
Coordinates45.7482, -108.57017
Functional classUrban 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length84 ft (25.6 m)
Longest span41 ft (12.5 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,349 (2023)
Projected traffic2,466 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$222,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S Frontage RD over Hogan`s Slough built?

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

What condition is S Frontage RD over Hogan`s Slough 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 November 2024.

How much traffic does S Frontage RD over Hogan`s Slough carry?

About 2,349 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is S Frontage RD over Hogan`s Slough?

The structure is 84 ft (25.6 m) long with a longest span of 41 ft (12.5 m) and a deck 30 ft wide.

Who owns S Frontage RD over Hogan`s Slough?

It is owned by the State Highway Agency.