US Bridges

Dearborn Canyon RD over Falls Creek 049

Fair

Lewis and Clark County, Montana · 2M SW Bean Lake · Structure no. L25420004+04001

Built
1960
65 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
52 ft
1 main span
Daily traffic
118
2023 count
Owner
County
County Highway Agency

About this bridge

Dearborn Canyon RD over Falls Creek 049 is a wood or timber stringer/multi-beam or girder carrying Dearborn Canyon RD over Falls Creek 049 in Lewis and Clark County, Montana. It was built in 1960, so it is 65 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 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 118 vehicles a day, roughly 3% of them trucks, projected to reach 124 by 2043. The structure is 52 ft (15.8 m) long and 15 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesDearborn Canyon RD
CrossesFalls Creek 049
Location2M SW Bean Lake
RouteCounty Highway 25420
CountyLewis and Clark County
StateMontana
Coordinates47.27766, -112.48381
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length52 ft (15.8 m)
Longest span50 ft (15.2 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic118 (2023)
Projected traffic124 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 Dearborn Canyon RD over Falls Creek 049 built?

It was built in 1960, making it 65 years old in 2025.

What condition is Dearborn Canyon RD over Falls Creek 049 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 October 2024.

How much traffic does Dearborn Canyon RD over Falls Creek 049 carry?

About 118 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Dearborn Canyon RD over Falls Creek 049?

The structure is 52 ft (15.8 m) long with a longest span of 50 ft (15.2 m) and a deck 15 ft wide.

Who owns Dearborn Canyon RD over Falls Creek 049?

It is owned by the County Highway Agency.