US Bridges

Seward Highway over Granite Creek

Fair

Kenai Peninsula Borough, Alaska · Mile Point 62.5 · Structure no. 0616

Built
1995
30 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Prestressed Concrete
Length
125 ft
1 main span
Daily traffic
3,480
2020 count
Owner
State
State Highway Agency

About this bridge

Seward Highway over Granite Creek is a prestressed concrete tee beam carrying Seward Highway over Granite Creek in Kenai Peninsula Borough, Alaska. It was built in 1995, so it is 30 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 3,480 vehicles a day, roughly 12% of them trucks, projected to reach 5,650 by 2039. The structure is 125 ft (38.1 m) long and 57 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSeward Highway
CrossesGranite Creek
LocationMile Point 62.5
RouteInterstate 0A32
StateAlaska
Coordinates60.7275, -149.28694
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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating75.7 US tons
Inventory rating46.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length125 ft (38.1 m)
Longest span122 ft (37.3 m)
Deck width57 ft (17.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,480 (2020)
Projected traffic5,650 by 2039
Trucks12%
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 Seward Highway over Granite Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is Seward Highway over Granite 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 August 2023.

How much traffic does Seward Highway over Granite Creek carry?

About 3,480 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Seward Highway over Granite Creek?

The structure is 125 ft (38.1 m) long with a longest span of 122 ft (37.3 m) and a deck 57 ft wide.

Who owns Seward Highway over Granite Creek?

It is owned by the State Highway Agency.