US Bridges

Porcupine Crossing over Klehini River

Good

Haines Borough, Alaska · Mile Point 0.1 · Structure no. 1216

Built
2017
8 years old
Condition
Good
inspected May 2024
Type
Tee Beam
Prestressed Concrete
Length
360 ft
3 main spans
Daily traffic
110
2020 count
Owner
County
County Highway Agency

About this bridge

Porcupine Crossing over Klehini River is a prestressed concrete tee beam carrying Porcupine Crossing over Klehini River in Haines Borough, Alaska. It was built in 2017, so it is 8 years old, younger than the Alaska average of 35.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 110 vehicles a day, roughly 21% of them trucks, projected to reach 180 by 2039. The structure is 360 ft (109.7 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesPorcupine Crossing
CrossesKlehini River
LocationMile Point 0.1
RouteState Highway NSP00
StateAlaska
Coordinates59.41263, -135.99945
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating105.2 US tons
Inventory rating62.9 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHL 93
Structure length360 ft (109.7 m)
Longest span119 ft (36.4 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2020)
Projected traffic180 by 2039
Trucks21%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Porcupine Crossing over Klehini River built?

It was built in 2017, making it 8 years old in 2025.

What condition is Porcupine Crossing over Klehini River 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 May 2024.

How much traffic does Porcupine Crossing over Klehini River carry?

About 110 vehicles per day (2020 count), of which roughly 21% are trucks.

How long is Porcupine Crossing over Klehini River?

The structure is 360 ft (109.7 m) long with a longest span of 119 ft (36.4 m) and a deck 33 ft wide.

Who owns Porcupine Crossing over Klehini River?

It is owned by the County Highway Agency.