US Bridges

Alyeska Highway over Girdwood Overhead

Fair

Anchorage Municipality, Alaska · Mile Point 0.2 · Structure no. 1001

Built
1967
58 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
121 ft
3 main spans
Daily traffic
2,510
2020 count
Owner
State
State Highway Agency

About this bridge

Alyeska Highway over Girdwood Overhead is a steel stringer/multi-beam or girder carrying Alyeska Highway over Girdwood Overhead in Anchorage Municipality, Alaska. It was built in 1967, so it is 58 years old, older than the Alaska average of 35.9 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 2,510 vehicles a day, roughly 12% of them trucks, projected to reach 3,710 by 2039. The structure is 121 ft (36.9 m) long and 40 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesAlyeska Highway
CrossesGirdwood Overhead
LocationMile Point 0.2
RouteState Highway 501
CountyAnchorage Municipality
StateAlaska
Coordinates60.94333, -149.17083
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length121 ft (36.9 m)
Longest span40 ft (12.2 m)
Deck width40 ft (12.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,510 (2020)
Projected traffic3,710 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Alyeska Highway over Girdwood Overhead built?

It was built in 1967, making it 58 years old in 2025.

What condition is Alyeska Highway over Girdwood Overhead 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 2023.

How much traffic does Alyeska Highway over Girdwood Overhead carry?

About 2,510 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Alyeska Highway over Girdwood Overhead?

The structure is 121 ft (36.9 m) long with a longest span of 40 ft (12.2 m) and a deck 40 ft wide.

Who owns Alyeska Highway over Girdwood Overhead?

It is owned by the State Highway Agency.