US Bridges

Frontage Rd-S 205 over RR

Fair

Gallatin County, Montana · Logan · Structure no. S00205005+00671

Built
2007
18 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
313 ft
3 main spans
Daily traffic
1,162
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 2007, so it is 18 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 5 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 1,162 vehicles a day, roughly 2% of them trucks, projected to reach 1,220 by 2043. The structure is 313 ft (95.5 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesFrontage Rd-S 205
CrossesRR
LocationLogan
RouteState Highway 205
CountyGallatin County
StateMontana
Coordinates45.88469, -111.43711
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length313 ft (95.5 m)
Longest span123 ft (37.5 m)
Deck width33 ft (10.2 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,162 (2023)
Projected traffic1,220 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed6.8 mi (11 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Frontage Rd-S 205 over RR built?

It was built in 2007, making it 18 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 August 2023.

How much traffic does Frontage Rd-S 205 over RR carry?

About 1,162 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Frontage Rd-S 205 over RR?

The structure is 313 ft (95.5 m) long with a longest span of 123 ft (37.5 m) and a deck 33 ft wide.

Who owns Frontage Rd-S 205 over RR?

It is owned by the State Highway Agency.