US Bridges

Frontage Rd-S 205 over Baker Creek

Fair

Gallatin County, Montana · 2M SE Manhattan · Structure no. S00205013+00791

Built
1921
104 years old, rebuilt 1934
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete
Length
52 ft
2 main spans
Daily traffic
2,274
2023 count
Owner
State
State Highway Agency

About this bridge

Frontage Rd-S 205 over Baker Creek is a concrete tee beam carrying Frontage Rd-S 205 over Baker Creek in Gallatin County, Montana. It was built in 1921 and reconstructed in 1934, so it is 104 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 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 2,274 vehicles a day, roughly 1% of them trucks, projected to reach 2,388 by 2043. The structure is 52 ft (15.8 m) long and 31 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesFrontage Rd-S 205
CrossesBaker Creek
Location2M SE Manhattan
RouteState Highway 205
CountyGallatin County
StateMontana
Coordinates45.8377, -111.29552
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.1 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckOther
Main spans2
Design loadH 15
Structure length52 ft (15.8 m)
Longest span25 ft (7.6 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 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
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Frontage Rd-S 205 over Baker Creek built?

It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1934.

What condition is Frontage Rd-S 205 over Baker Creek 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 April 2024.

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

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

How long is Frontage Rd-S 205 over Baker Creek?

The structure is 52 ft (15.8 m) long with a longest span of 25 ft (7.6 m) and a deck 31 ft wide.

Who owns Frontage Rd-S 205 over Baker Creek?

It is owned by the State Highway Agency.