US Bridges

Denali Highway over Brushkana Creek

FairPosted for load

Matanuska-Susitna Borough, Alaska · Mile Point 104.7 · Structure no. 0689

Built
1955
70 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
60
2020 count
Owner
State
State Highway Agency

About this bridge

Denali Highway over Brushkana Creek is a steel stringer/multi-beam or girder carrying Denali Highway over Brushkana Creek in Matanuska-Susitna Borough, Alaska. It was built in 1955, so it is 70 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. Its operating status is: posted for load restriction.

It carries about 60 vehicles a day, roughly 21% of them trucks, projected to reach 70 by 2039. The structure is 81 ft (24.8 m) long and 21 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesDenali Highway
CrossesBrushkana Creek
LocationMile Point 104.7
RouteState Highway 750
CountyMatanuska-Susitna Borough
StateAlaska
Coordinates63.2882, -148.0669
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
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 statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating35.4 US tons
Inventory rating21.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length81 ft (24.8 m)
Longest span79 ft (24.2 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2020)
Projected traffic70 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

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 Denali Highway over Brushkana Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is Denali Highway over Brushkana 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 Denali Highway over Brushkana Creek carry?

About 60 vehicles per day (2020 count), of which roughly 21% are trucks.

How long is Denali Highway over Brushkana Creek?

The structure is 81 ft (24.8 m) long with a longest span of 79 ft (24.2 m) and a deck 21 ft wide.

Who owns Denali Highway over Brushkana Creek?

It is owned by the State Highway Agency.