US Bridges

Mt 38-SKALKAHO RD over W Fork Rock Creek 006

Good

Granite County, Montana · 10M E Skalkaho Pass · Structure no. L20001010+06001

Built
1991
34 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
223
2023 count
Owner
State
State Highway Agency

About this bridge

Mt 38-SKALKAHO RD over W Fork Rock Creek 006 is a prestressed concrete stringer/multi-beam or girder carrying Mt 38-SKALKAHO RD over W Fork Rock Creek 006 in Granite County, Montana. It was built in 1991, so it is 34 years old, younger 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 223 vehicles a day, roughly 2% of them trucks, projected to reach 234 by 2043. The structure is 62 ft (18.9 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesMt 38-SKALKAHO RD
CrossesW Fork Rock Creek 006
Location10M E Skalkaho Pass
RouteState Highway 38
StateMontana
Coordinates46.24553, -113.63124
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 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 alignment6: Equal to present minimum criteria
Operating rating58.2 US tons
Inventory rating33.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic223 (2023)
Projected traffic234 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Mt 38-SKALKAHO RD over W Fork Rock Creek 006 built?

It was built in 1991, making it 34 years old in 2025.

What condition is Mt 38-SKALKAHO RD over W Fork Rock Creek 006 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 July 2024.

How much traffic does Mt 38-SKALKAHO RD over W Fork Rock Creek 006 carry?

About 223 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Mt 38-SKALKAHO RD over W Fork Rock Creek 006?

The structure is 62 ft (18.9 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns Mt 38-SKALKAHO RD over W Fork Rock Creek 006?

It is owned by the State Highway Agency.