US Bridges

I 315S over FAU 5225-14th ST SW

Good

Cascade County, Montana · Great Falls · Structure no. I00315000+03422

Built
1967
58 years old, rebuilt 1995
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
150 ft
3 main spans
Daily traffic
6,326
2023 count
Owner
State
State Highway Agency

About this bridge

I 315S over FAU 5225-14th ST SW is a prestressed concrete stringer/multi-beam or girder carrying I 315S over FAU 5225-14th ST SW in Cascade County, Montana. It was built in 1967 and reconstructed in 1995, so it is 58 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,326 vehicles a day, roughly 5% of them trucks, projected to reach 6,642 by 2043. The structure is 150 ft (45.6 m) long and 47 ft wide.

CarriesI 315S
CrossesFAU 5225-14th ST SW
LocationGreat Falls
RouteInterstate 315
StateMontana
Coordinates47.48697, -111.33819
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating45 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length150 ft (45.6 m)
Longest span52 ft (15.7 m)
Deck width47 ft (14.4 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deck20 ft (6 m)

Traffic and service

Average daily traffic6,326 (2023)
Projected traffic6,642 by 2043
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 315S over FAU 5225-14th ST SW built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1995.

What condition is I 315S over FAU 5225-14th ST SW in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does I 315S over FAU 5225-14th ST SW carry?

About 6,326 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is I 315S over FAU 5225-14th ST SW?

The structure is 150 ft (45.6 m) long with a longest span of 52 ft (15.7 m) and a deck 47 ft wide.

Who owns I 315S over FAU 5225-14th ST SW?

It is owned by the State Highway Agency.