US Bridges

S 64th ST W over Canyon Creek 048

Good

Yellowstone County, Montana · 8M NE Laurel · Structure no. L56507003+03001

Built
1967
58 years old
Condition
Good
inspected November 2024
Type
Channel Beam
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
881
2023 count
Owner
County
County Highway Agency

About this bridge

S 64th ST W over Canyon Creek 048 is a prestressed concrete channel beam carrying S 64th ST W over Canyon Creek 048 in Yellowstone County, Montana. It was built in 1967, so it is 58 years old, older 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 881 vehicles a day, roughly 3% of them trucks, projected to reach 938 by 2043. The structure is 70 ft (21.3 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesS 64th ST W
CrossesCanyon Creek 048
Location8M NE Laurel
RouteCounty Highway 56507
StateMontana
Coordinates45.73623, -108.6794
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length70 ft (21.3 m)
Longest span66 ft (20.1 m)
Deck width30 ft (9.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic881 (2023)
Projected traffic938 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 S 64th ST W over Canyon Creek 048 built?

It was built in 1967, making it 58 years old in 2025.

What condition is S 64th ST W over Canyon Creek 048 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 November 2024.

How much traffic does S 64th ST W over Canyon Creek 048 carry?

About 881 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is S 64th ST W over Canyon Creek 048?

The structure is 70 ft (21.3 m) long with a longest span of 66 ft (20.1 m) and a deck 30 ft wide.

Who owns S 64th ST W over Canyon Creek 048?

It is owned by the County Highway Agency.