US Bridges

Pryor RD over Hamilton Creek 133

Fair

Yellowstone County, Montana · 9M NE Pryor · Structure no. L56300014+04241

Built
1997
28 years old
Condition
Fair
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
765
2023 count
Owner
State
State Highway Agency

About this bridge

Pryor RD over Hamilton Creek 133 is a prestressed concrete tee beam carrying Pryor RD over Hamilton Creek 133 in Yellowstone County, Montana. It was built in 1997, so it is 28 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 765 vehicles a day, roughly 2% of them trucks, projected to reach 899 by 2043. The structure is 45 ft (13.7 m) long and 36 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

CarriesPryor RD
CrossesHamilton Creek 133
Location9M NE Pryor
RouteState Highway 418
StateMontana
Coordinates45.53438, -108.42611
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span45 ft (13.7 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic765 (2023)
Projected traffic899 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Pryor RD over Hamilton Creek 133 built?

It was built in 1997, making it 28 years old in 2025.

What condition is Pryor RD over Hamilton Creek 133 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 December 2024.

How much traffic does Pryor RD over Hamilton Creek 133 carry?

About 765 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Pryor RD over Hamilton Creek 133?

The structure is 45 ft (13.7 m) long with a longest span of 45 ft (13.7 m) and a deck 36 ft wide.

Who owns Pryor RD over Hamilton Creek 133?

It is owned by the State Highway Agency.