US Bridges

Razor Creek RD over Razor Creek 164

Fair

Yellowstone County, Montana · 3M N Shepherd · Structure no. L56800000+05001

Built
1977
48 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Razor Creek RD over Razor Creek 164 is a prestressed concrete tee beam carrying Razor Creek RD over Razor Creek 164 in Yellowstone County, Montana. It was built in 1977, so it is 48 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 32 ft (9.8 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesRazor Creek RD
CrossesRazor Creek 164
Location3M N Shepherd
RouteCounty Highway 56800
StateMontana
Coordinates45.96694, -108.29801
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 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 closed6.2 mi (10 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 Razor Creek RD over Razor Creek 164 built?

It was built in 1977, making it 48 years old in 2025.

What condition is Razor Creek RD over Razor Creek 164 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 January 2025.

How much traffic does Razor Creek RD over Razor Creek 164 carry?

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

How long is Razor Creek RD over Razor Creek 164?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 24 ft wide.

Who owns Razor Creek RD over Razor Creek 164?

It is owned by the County Highway Agency.