US Bridges

Back Loop RD over Lake Creek

Fair

Juneau City and Borough, Alaska · Mile Point 3.3 · Structure no. 0873

Built
1968
57 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
40 ft
2 main spans
Daily traffic
2,770
2020 count
Owner
State
State Highway Agency

About this bridge

Back Loop RD over Lake Creek is a concrete slab carrying Back Loop RD over Lake Creek in Juneau City and Borough, Alaska. It was built in 1968, so it is 57 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 2,770 vehicles a day, roughly 6% of them trucks, projected to reach 8,370 by 2039. The structure is 40 ft (12.2 m) long and 39 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesBack Loop RD
CrossesLake Creek
LocationMile Point 3.3
RouteState Highway 966
CountyJuneau City and Borough
StateAlaska
Coordinates58.3926, -134.6327
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span19 ft (5.8 m)
Deck width39 ft (12 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,770 (2020)
Projected traffic8,370 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Back Loop RD over Lake Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is Back Loop RD over Lake 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 June 2023.

How much traffic does Back Loop RD over Lake Creek carry?

About 2,770 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Back Loop RD over Lake Creek?

The structure is 40 ft (12.2 m) long with a longest span of 19 ft (5.8 m) and a deck 39 ft wide.

Who owns Back Loop RD over Lake Creek?

It is owned by the State Highway Agency.