US Bridges

Lil Porcupine CR R over Little Porcupine CR 014

Fair

Rosebud County, Montana · 11M N Forsyth · Structure no. L44202011+04001

Built
1978
47 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
92 ft
1 main span
Daily traffic
190
2023 count
Owner
County
County Highway Agency

About this bridge

Lil Porcupine CR R over Little Porcupine CR 014 is a prestressed concrete tee beam carrying Lil Porcupine CR R over Little Porcupine CR 014 in Rosebud County, Montana. It was built in 1978, so it is 47 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 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 190 vehicles a day, roughly 1% of them trucks, projected to reach 200 by 2043. The structure is 92 ft (28 m) long and 26 ft wide. If it were closed, the detour would be 85.7 mi (138 km).

Location

Open in Google Maps
CarriesLil Porcupine CR R
CrossesLittle Porcupine CR 014
Location11M N Forsyth
RouteCounty Highway 44202
CountyRosebud County
StateMontana
Coordinates46.41532, -106.63422
Functional classRural Minor 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.
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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.9 US tons
Inventory rating34 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length92 ft (28 m)
Longest span90 ft (27.4 m)
Deck width26 ft (8 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic190 (2023)
Projected traffic200 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed85.7 mi (138 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 Lil Porcupine CR R over Little Porcupine CR 014 built?

It was built in 1978, making it 47 years old in 2025.

What condition is Lil Porcupine CR R over Little Porcupine CR 014 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 Lil Porcupine CR R over Little Porcupine CR 014 carry?

About 190 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Lil Porcupine CR R over Little Porcupine CR 014?

The structure is 92 ft (28 m) long with a longest span of 90 ft (27.4 m) and a deck 26 ft wide.

Who owns Lil Porcupine CR R over Little Porcupine CR 014?

It is owned by the County Highway Agency.