US Bridges

Frontage Road 925 over Int Jeff City-I 15 001

Fair

Jefferson County, Montana · Jefferson City · Structure no. L22925000+02001

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
269 ft
4 main spans
Daily traffic
100
2025 count
Owner
State
State Highway Agency

About this bridge

Frontage Road 925 over Int Jeff City-I 15 001 is a prestressed concrete stringer/multi-beam or girder carrying Frontage Road 925 over Int Jeff City-I 15 001 in Jefferson County, Montana. It was built in 1970, so it is 55 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 269 ft (82.1 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesFrontage Road 925
CrossesInt Jeff City-I 15 001
LocationJefferson City
RouteState Highway 22925
CountyJefferson County
StateMontana
Coordinates46.38821, -112.02494
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating45 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length269 ft (82.1 m)
Longest span75 ft (22.9 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed9.9 mi (16 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 Road 925 over Int Jeff City-I 15 001 built?

It was built in 1970, making it 55 years old in 2025.

What condition is Frontage Road 925 over Int Jeff City-I 15 001 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 Road 925 over Int Jeff City-I 15 001 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Frontage Road 925 over Int Jeff City-I 15 001?

The structure is 269 ft (82.1 m) long with a longest span of 75 ft (22.9 m) and a deck 34 ft wide.

Who owns Frontage Road 925 over Int Jeff City-I 15 001?

It is owned by the State Highway Agency.