US Bridges

Glenn Highway over Anchorage-Palmer Ramp Oh

Fair

Matanuska-Susitna Borough, Alaska · Mile Point 33.7 · Structure no. 2120

Built
2004
21 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
93 ft
1 main span
Daily traffic
1,245
2020 count
Owner
State
State Highway Agency

About this bridge

Glenn Highway over Anchorage-Palmer Ramp Oh is a prestressed concrete box beam or girders - multiple carrying Glenn Highway over Anchorage-Palmer Ramp Oh in Matanuska-Susitna Borough, Alaska. It was built in 2004, so it is 21 years old, younger 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 1,245 vehicles a day, roughly 9% of them trucks, projected to reach 1,450 by 2039. The structure is 93 ft (28.3 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGlenn Highway
CrossesAnchorage-Palmer Ramp Oh
LocationMile Point 33.7
RouteInterstate 0A16
CountyMatanuska-Susitna Borough
StateAlaska
Coordinates61.5493, -149.2508
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating80 US tons
Inventory rating48 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length93 ft (28.3 m)
Longest span90 ft (27.4 m)
Deck width38 ft (11.7 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,245 (2020)
Projected traffic1,450 by 2039
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Glenn Highway over Anchorage-Palmer Ramp Oh built?

It was built in 2004, making it 21 years old in 2025.

What condition is Glenn Highway over Anchorage-Palmer Ramp Oh 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 July 2023.

How much traffic does Glenn Highway over Anchorage-Palmer Ramp Oh carry?

About 1,245 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is Glenn Highway over Anchorage-Palmer Ramp Oh?

The structure is 93 ft (28.3 m) long with a longest span of 90 ft (27.4 m) and a deck 38 ft wide.

Who owns Glenn Highway over Anchorage-Palmer Ramp Oh?

It is owned by the State Highway Agency.