US Bridges

Blue Mountain Road over O`brien Creek 114

Good

Missoula County, Montana · W of Missoula · Structure no. L32116002+08001

Built
1998
27 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
2,192
2023 count
Owner
County
County Highway Agency

About this bridge

Blue Mountain Road over O`brien Creek 114 is a concrete slab carrying Blue Mountain Road over O`brien Creek 114 in Missoula County, Montana. It was built in 1998, so it is 27 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 2,192 vehicles a day, roughly 3% of them trucks, projected to reach 2,334 by 2043. The structure is 25 ft (7.6 m) long and 96 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesBlue Mountain Road
CrossesO`brien Creek 114
LocationW of Missoula
RouteCounty Highway 32116
CountyMissoula County
StateMontana
Coordinates46.84984, -114.10989
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width96 ft (29.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,192 (2023)
Projected traffic2,334 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Blue Mountain Road over O`brien Creek 114 built?

It was built in 1998, making it 27 years old in 2025.

What condition is Blue Mountain Road over O`brien Creek 114 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 2023.

How much traffic does Blue Mountain Road over O`brien Creek 114 carry?

About 2,192 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Blue Mountain Road over O`brien Creek 114?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 96 ft wide.

Who owns Blue Mountain Road over O`brien Creek 114?

It is owned by the County Highway Agency.