US Bridges

Kona Ranch RD over Clark Fork 011

Fair

Missoula County, Montana · 8M W Missoula · Structure no. L32107000+08001

Built
1987
38 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
725 ft
4 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Kona Ranch RD over Clark Fork 011 is a steel continuous stringer/multi-beam or girder carrying Kona Ranch RD over Clark Fork 011 in Missoula County, Montana. It was built in 1987, so it is 38 years old, younger 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 6 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 725 ft (220.9 m) long and 40 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesKona Ranch RD
CrossesClark Fork 011
Location8M W Missoula
RouteCounty Highway 32107
CountyMissoula County
StateMontana
Coordinates46.89943, -114.14992
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length725 ft (220.9 m)
Longest span200 ft (60.9 m)
Deck width40 ft (12.3 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 Kona Ranch RD over Clark Fork 011 built?

It was built in 1987, making it 38 years old in 2025.

What condition is Kona Ranch RD over Clark Fork 011 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 July 2024.

How much traffic does Kona Ranch RD over Clark Fork 011 carry?

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

How long is Kona Ranch RD over Clark Fork 011?

The structure is 725 ft (220.9 m) long with a longest span of 200 ft (60.9 m) and a deck 40 ft wide.

Who owns Kona Ranch RD over Clark Fork 011?

It is owned by the County Highway Agency.