US Bridges

Basin Road over Basin Road Trestle

Good

Juneau City and Borough, Alaska · Mile Point 0.3 · Structure no. 0948

Built
1936
89 years old, rebuilt 2012
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
407 ft
42 main spans
Daily traffic
280
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Basin Road over Basin Road Trestle is a wood or timber stringer/multi-beam or girder carrying Basin Road over Basin Road Trestle in Juneau City and Borough, Alaska. It was built in 1936 and reconstructed in 2012, so it is 89 years old, older than the Alaska average of 35.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 280 vehicles a day, roughly 1% of them trucks, projected to reach 336 by 2035. The structure is 407 ft (124.1 m) long and 17 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesBasin Road
CrossesBasin Road Trestle
LocationMile Point 0.3
RouteState Highway NSPCY
StateAlaska
Coordinates58.3065, -134.4096
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating48.9 US tons
Inventory rating36 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans42
Design loadHS 20
Structure length407 ft (124.1 m)
Longest span15 ft (4.6 m)
Deck width17 ft (5.3 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic280 (2018)
Projected traffic336 by 2035
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesOther
Detour if closed123.7 mi (199 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 Basin Road over Basin Road Trestle built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 2012.

What condition is Basin Road over Basin Road Trestle in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Basin Road over Basin Road Trestle carry?

About 280 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Basin Road over Basin Road Trestle?

The structure is 407 ft (124.1 m) long with a longest span of 15 ft (4.6 m) and a deck 17 ft wide.

Who owns Basin Road over Basin Road Trestle?

It is owned by the City or Municipal Highway Agency.