US Bridges

Calhoun Avenue over Calhoun Viaduct

Fair

Juneau City and Borough, Alaska · Mile Point 0.2 · Structure no. 1068

Built
1934
91 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
295 ft
15 main spans
Daily traffic
2,816
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Calhoun Avenue over Calhoun Viaduct is a concrete continuous stringer/multi-beam or girder carrying Calhoun Avenue over Calhoun Viaduct in Juneau City and Borough, Alaska. It was built in 1934, so it is 91 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 2,816 vehicles a day, roughly 6% of them trucks, projected to reach 3,800 by 2035. The structure is 295 ft (89.9 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesCalhoun Avenue
CrossesCalhoun Viaduct
LocationMile Point 0.2
RouteState Highway 981
CountyJuneau City and Borough
StateAlaska
Coordinates58.30194, -134.41278
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating57.7 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans15
Design loadH 15
Structure length295 ft (89.9 m)
Longest span21 ft (6.4 m)
Deck width30 ft (9.1 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deck14 ft (4.1 m)

Traffic and service

Average daily traffic2,816 (2018)
Projected traffic3,800 by 2035
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesOther
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Calhoun Avenue over Calhoun Viaduct built?

It was built in 1934, making it 91 years old in 2025.

What condition is Calhoun Avenue over Calhoun Viaduct 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 June 2023.

How much traffic does Calhoun Avenue over Calhoun Viaduct carry?

About 2,816 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is Calhoun Avenue over Calhoun Viaduct?

The structure is 295 ft (89.9 m) long with a longest span of 21 ft (6.4 m) and a deck 30 ft wide.

Who owns Calhoun Avenue over Calhoun Viaduct?

It is owned by the City or Municipal Highway Agency.