US Bridges

W Ninemile RD over Ninemile Creek 029

Fair

Missoula County, Montana · 12M NW Frenchtown · Structure no. L32003004+04001

Built
1972
53 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
64 ft
3 main spans
Daily traffic
486
2023 count
Owner
County
County Highway Agency

About this bridge

W Ninemile RD over Ninemile Creek 029 is a wood or timber stringer/multi-beam or girder carrying W Ninemile RD over Ninemile Creek 029 in Missoula County, Montana. It was built in 1972, so it is 53 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 486 vehicles a day, roughly 3% of them trucks, projected to reach 520 by 2043. The structure is 64 ft (19.5 m) long and 18 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesW Ninemile RD
CrossesNinemile Creek 029
Location12M NW Frenchtown
RouteCounty Highway 32003
CountyMissoula County
StateMontana
Coordinates47.08149, -114.43907
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20
Structure length64 ft (19.5 m)
Longest span21 ft (6.4 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic486 (2023)
Projected traffic520 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 W Ninemile RD over Ninemile Creek 029 built?

It was built in 1972, making it 53 years old in 2025.

What condition is W Ninemile RD over Ninemile Creek 029 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 September 2023.

How much traffic does W Ninemile RD over Ninemile Creek 029 carry?

About 486 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is W Ninemile RD over Ninemile Creek 029?

The structure is 64 ft (19.5 m) long with a longest span of 21 ft (6.4 m) and a deck 18 ft wide.

Who owns W Ninemile RD over Ninemile Creek 029?

It is owned by the County Highway Agency.