US Bridges

Lower N Hill RD over Roberts Creek 005

Fair

Wheatland County, Montana · 14M SE Judith Gap · Structure no. L54125000+09001

Built
1962
63 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
40 ft
2 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Lower N Hill RD over Roberts Creek 005 is a prestressed concrete slab carrying Lower N Hill RD over Roberts Creek 005 in Wheatland County, Montana. It was built in 1962, so it is 63 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 40 ft (12.2 m) long and 22 ft wide. If it were closed, the detour would be 18 mi (29 km).

CarriesLower N Hill RD
CrossesRoberts Creek 005
Location14M SE Judith Gap
RouteCounty Highway 54136
StateMontana
Coordinates46.5022, -109.61926
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 inspectionSeptember 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.2 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 closed18 mi (29 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 Lower N Hill RD over Roberts Creek 005 built?

It was built in 1962, making it 63 years old in 2025.

What condition is Lower N Hill RD over Roberts Creek 005 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 September 2024.

How much traffic does Lower N Hill RD over Roberts Creek 005 carry?

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

How long is Lower N Hill RD over Roberts Creek 005?

The structure is 40 ft (12.2 m) long with a longest span of 19 ft (5.8 m) and a deck 22 ft wide.

Who owns Lower N Hill RD over Roberts Creek 005?

It is owned by the County Highway Agency.