US Bridges

Glenn Highway over Purinton Creek

Fair

Matanuska-Susitna Borough, Alaska · Mile Point 81.6 · Structure no. 0546

Built
1957
68 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
22 ft
1 main span
Daily traffic
1,110
2020 count
Owner
State
State Highway Agency

About this bridge

Glenn Highway over Purinton Creek is a steel stringer/multi-beam or girder carrying Glenn Highway over Purinton Creek in Matanuska-Susitna Borough, Alaska. It was built in 1957, so it is 68 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 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 1,110 vehicles a day, roughly 15% of them trucks, projected to reach 1,270 by 2039. The structure is 22 ft (6.7 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesGlenn Highway
CrossesPurinton Creek
LocationMile Point 81.6
RouteInterstate 0A15
CountyMatanuska-Susitna Borough
StateAlaska
Coordinates61.811, -148.1363
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionJuly 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.8 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length22 ft (6.7 m)
Longest span19 ft (5.8 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,110 (2020)
Projected traffic1,270 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Glenn Highway over Purinton Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Glenn Highway over Purinton 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 July 2023.

How much traffic does Glenn Highway over Purinton Creek carry?

About 1,110 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Glenn Highway over Purinton Creek?

The structure is 22 ft (6.7 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.

Who owns Glenn Highway over Purinton Creek?

It is owned by the State Highway Agency.