US Bridges

S 205-FRONTAGE RD over Mid Fork Madison River

Fair

Gallatin County, Montana · 2M E Three Forks · Structure no. S00205001+02381

Built
1990
35 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
98 ft
5 main spans
Daily traffic
1,501
2023 count
Owner
State
State Highway Agency

About this bridge

S 205-FRONTAGE RD over Mid Fork Madison River is a concrete continuous slab carrying S 205-FRONTAGE RD over Mid Fork Madison River in Gallatin County, Montana. It was built in 1990, so it is 35 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 1,501 vehicles a day, roughly 1% of them trucks, projected to reach 1,576 by 2043. The structure is 98 ft (29.8 m) long and 36 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesS 205-FRONTAGE RD
CrossesMid Fork Madison River
Location2M E Three Forks
RouteState Highway 205
CountyGallatin County
StateMontana
Coordinates45.89988, -111.5126
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating46 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length98 ft (29.8 m)
Longest span28 ft (8.4 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,501 (2023)
Projected traffic1,576 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 S 205-FRONTAGE RD over Mid Fork Madison River built?

It was built in 1990, making it 35 years old in 2025.

What condition is S 205-FRONTAGE RD over Mid Fork Madison River 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 S 205-FRONTAGE RD over Mid Fork Madison River carry?

About 1,501 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is S 205-FRONTAGE RD over Mid Fork Madison River?

The structure is 98 ft (29.8 m) long with a longest span of 28 ft (8.4 m) and a deck 36 ft wide.

Who owns S 205-FRONTAGE RD over Mid Fork Madison River?

It is owned by the State Highway Agency.