US Bridges

N Last Chance Gulc over RR

Good

Lewis and Clark County, Montana · Helena · Structure no. U05807000+07711

Built
2003
22 years old
Condition
Good
inspected October 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
144 ft
3 main spans
Daily traffic
18,569
2023 count
Owner
State
State Highway Agency

About this bridge

N Last Chance Gulc over RR is a prestressed concrete continuous tee beam carrying N Last Chance Gulc over RR in Lewis and Clark County, Montana. It was built in 2003, so it is 22 years old, younger 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 18,569 vehicles a day, projected to reach 20,240 by 2043. The structure is 144 ft (43.9 m) long and 92 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesN Last Chance Gulc
CrossesRR
LocationHelena
RouteCity Street 127
StateMontana
Coordinates46.60276, -112.02801
Functional classUrban Other Principal Arterial

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.
Substructure8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.9 US tons
Inventory rating61 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length144 ft (43.9 m)
Longest span68 ft (20.7 m)
Deck width92 ft (28.1 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,569 (2023)
Projected traffic20,240 by 2043
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 Last Chance Gulc over RR built?

It was built in 2003, making it 22 years old in 2025.

What condition is N Last Chance Gulc over RR 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 N Last Chance Gulc over RR carry?

About 18,569 vehicles per day (2023 count).

How long is N Last Chance Gulc over RR?

The structure is 144 ft (43.9 m) long with a longest span of 68 ft (20.7 m) and a deck 92 ft wide.

Who owns N Last Chance Gulc over RR?

It is owned by the State Highway Agency.