US Bridges

Dimnd-Minn On-Ramp over Campbell Creek NB Ramp

Fair

Anchorage Municipality, Alaska · Mile Point 0.0 · Structure no. 1444

Built
1981
44 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Prestressed Concrete
Length
140 ft
1 main span
Daily traffic
4,690
2020 count
Owner
State
State Highway Agency

About this bridge

Dimnd-Minn On-Ramp over Campbell Creek NB Ramp is a prestressed concrete tee beam carrying Dimnd-Minn On-Ramp over Campbell Creek NB Ramp in Anchorage Municipality, Alaska. It was built in 1981, so it is 44 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 4,690 vehicles a day, roughly 4% of them trucks, projected to reach 6,880 by 2039. The structure is 140 ft (42.7 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesDimnd-Minn On-Ramp
CrossesCampbell Creek NB Ramp
LocationMile Point 0.0
RouteState Highway 42
CountyAnchorage Municipality
StateAlaska
Coordinates61.14194, -149.90722
Functional classUrban Other Principal 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.7 US tons
Inventory rating34.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span137 ft (41.8 m)
Deck width37 ft (11.3 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,690 (2020)
Projected traffic6,880 by 2039
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Dimnd-Minn On-Ramp over Campbell Creek NB Ramp built?

It was built in 1981, making it 44 years old in 2025.

What condition is Dimnd-Minn On-Ramp over Campbell Creek NB Ramp 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 Dimnd-Minn On-Ramp over Campbell Creek NB Ramp carry?

About 4,690 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is Dimnd-Minn On-Ramp over Campbell Creek NB Ramp?

The structure is 140 ft (42.7 m) long with a longest span of 137 ft (41.8 m) and a deck 37 ft wide.

Who owns Dimnd-Minn On-Ramp over Campbell Creek NB Ramp?

It is owned by the State Highway Agency.