US Bridges

Irrsr Nd Hiway 24 over Porcupine Creek

Fair

Sioux County, North Dakota · 5 North of Fort Yates · Structure no. 0024015004

Built
1963
62 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
200 ft
3 main spans
Daily traffic
1,740
2019 count
Owner
State
State Highway Agency

About this bridge

Irrsr Nd Hiway 24 over Porcupine Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying Irrsr Nd Hiway 24 over Porcupine Creek in Sioux County, North Dakota. It was built in 1963, so it is 62 years old, older than the North Dakota average of 48.2 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 1,740 vehicles a day, roughly 5% of them trucks, projected to reach 1,852 by 2039. The structure is 200 ft (61 m) long and 35 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

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CarriesIrrsr Nd Hiway 24
CrossesPorcupine Creek
Location5 North of Fort Yates
RouteState Highway 24
CountySioux County
StateNorth Dakota
Coordinates46.16713, -100.68343
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating63.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length200 ft (61 m)
Longest span65 ft (19.8 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,740 (2019)
Projected traffic1,852 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 Irrsr Nd Hiway 24 over Porcupine Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Irrsr Nd Hiway 24 over Porcupine Creek 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 Irrsr Nd Hiway 24 over Porcupine Creek carry?

About 1,740 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Irrsr Nd Hiway 24 over Porcupine Creek?

The structure is 200 ft (61 m) long with a longest span of 65 ft (19.8 m) and a deck 35 ft wide.

Who owns Irrsr Nd Hiway 24 over Porcupine Creek?

It is owned by the State Highway Agency.