US Bridges

Frontage Rd-S 205 over RR

Fair

Gallatin County, Montana · Manhattan · Structure no. S00205011+09551

Built
2010
15 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
374 ft
3 main spans
Daily traffic
2,274
2023 count
Owner
State
State Highway Agency

About this bridge

Frontage Rd-S 205 over RR is a steel continuous stringer/multi-beam or girder carrying Frontage Rd-S 205 over RR in Gallatin County, Montana. It was built in 2010, so it is 15 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 2,274 vehicles a day, roughly 1% of them trucks, projected to reach 2,388 by 2043. The structure is 374 ft (114 m) long and 41 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesFrontage Rd-S 205
CrossesRR
LocationManhattan
RouteState Highway 205
CountyGallatin County
StateMontana
Coordinates45.84702, -111.31433
Functional classRural Major 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length374 ft (114 m)
Longest span144 ft (44 m)
Deck width41 ft (12.6 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,274 (2023)
Projected traffic2,388 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed11.2 mi (18 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$1.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Frontage Rd-S 205 over RR built?

It was built in 2010, making it 15 years old in 2025.

What condition is Frontage Rd-S 205 over RR 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 Frontage Rd-S 205 over RR carry?

About 2,274 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Frontage Rd-S 205 over RR?

The structure is 374 ft (114 m) long with a longest span of 144 ft (44 m) and a deck 41 ft wide.

Who owns Frontage Rd-S 205 over RR?

It is owned by the State Highway Agency.