US Bridges

Porcupine Ridge RD over Mid Fork Judith Rv 035

Fair

Judith Basin County, Montana · 2M S Sapphire · Structure no. L23024000+02001

Built
2008
17 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
66 ft
2 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Porcupine Ridge RD over Mid Fork Judith Rv 035 is a steel stringer/multi-beam or girder carrying Porcupine Ridge RD over Mid Fork Judith Rv 035 in Judith Basin County, Montana. It was built in 2008, so it is 17 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 66 ft (20 m) long and 23 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesPorcupine Ridge RD
CrossesMid Fork Judith Rv 035
Location2M S Sapphire
RouteCounty Highway 23024
CountyJudith Basin County
StateMontana
Coordinates46.85921, -110.26282
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadHS 20
Structure length66 ft (20 m)
Longest span35 ft (10.8 m)
Deck width23 ft (6.9 m)
Roadway width23 ft (6.9 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 closed123.7 mi (199 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$81,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Porcupine Ridge RD over Mid Fork Judith Rv 035 built?

It was built in 2008, making it 17 years old in 2025.

What condition is Porcupine Ridge RD over Mid Fork Judith Rv 035 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 June 2024.

How much traffic does Porcupine Ridge RD over Mid Fork Judith Rv 035 carry?

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

How long is Porcupine Ridge RD over Mid Fork Judith Rv 035?

The structure is 66 ft (20 m) long with a longest span of 35 ft (10.8 m) and a deck 23 ft wide.

Who owns Porcupine Ridge RD over Mid Fork Judith Rv 035?

It is owned by the County Highway Agency.