US Bridges

N 7th Ave-Frtg RD over RR - Mrl

Fair

Gallatin County, Montana · Bozeman-N Seventh Ave · Structure no. U01207002+01081

Built
1993
32 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
391 ft
3 main spans
Daily traffic
6,113
2023 count
Owner
State
State Highway Agency

About this bridge

N 7th Ave-Frtg RD over RR - Mrl is a steel continuous stringer/multi-beam or girder carrying N 7th Ave-Frtg RD over RR - Mrl in Gallatin County, Montana. It was built in 1993, so it is 32 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 6,113 vehicles a day, roughly 1% of them trucks, projected to reach 6,419 by 2043. The structure is 391 ft (119.1 m) long and 42 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesN 7th Ave-Frtg RD
CrossesRR - Mrl
LocationBozeman-N Seventh Ave
RouteState Highway 118
CountyGallatin County
StateMontana
Coordinates45.70694, -111.0466
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating25 US tons
Inventory rating6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length391 ft (119.1 m)
Longest span144 ft (43.9 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,113 (2023)
Projected traffic6,419 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was N 7th Ave-Frtg RD over RR - Mrl built?

It was built in 1993, making it 32 years old in 2025.

What condition is N 7th Ave-Frtg RD over RR - Mrl 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 N 7th Ave-Frtg RD over RR - Mrl carry?

About 6,113 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is N 7th Ave-Frtg RD over RR - Mrl?

The structure is 391 ft (119.1 m) long with a longest span of 144 ft (43.9 m) and a deck 42 ft wide.

Who owns N 7th Ave-Frtg RD over RR - Mrl?

It is owned by the State Highway Agency.