US Bridges

Canyon Creek RD over Canyon Creek 042

Fair

Yellowstone County, Montana · 9M NW Laurel · Structure no. L56533002+07001

Built
1965
60 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Canyon Creek RD over Canyon Creek 042 is a prestressed concrete tee beam carrying Canyon Creek RD over Canyon Creek 042 in Yellowstone County, Montana. It was built in 1965, so it is 60 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 24 ft (7.3 m) long and 20 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesCanyon Creek RD
CrossesCanyon Creek 042
Location9M NW Laurel
RouteCounty Highway 56533
StateMontana
Coordinates45.7878, -108.86753
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
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width20 ft (6.2 m)
Roadway width19 ft (5.8 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 closed11.8 mi (19 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 Canyon Creek RD over Canyon Creek 042 built?

It was built in 1965, making it 60 years old in 2025.

What condition is Canyon Creek RD over Canyon Creek 042 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 May 2023.

How much traffic does Canyon Creek RD over Canyon Creek 042 carry?

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

How long is Canyon Creek RD over Canyon Creek 042?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 20 ft wide.

Who owns Canyon Creek RD over Canyon Creek 042?

It is owned by the County Highway Agency.