US Bridges

Marine HWY Route over Petersburg Ferry Term

Fair

Petersburg Census Area, Alaska · Petersburg · Structure no. 0802

Built
1986
39 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Steel
Length
500 ft
1 main span
Daily traffic
53
2018 count
Owner
State
State Highway Agency

About this bridge

Marine HWY Route over Petersburg Ferry Term is a steel box beam or girders - multiple carrying Marine HWY Route over Petersburg Ferry Term in Petersburg Census Area, Alaska. It was built in 1986, so it is 39 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 53 vehicles a day, roughly 8% of them trucks, projected to reach 100 by 2035. The structure is 500 ft (152.4 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesMarine HWY Route
CrossesPetersburg Ferry Term
LocationPetersburg
RouteState Highway 937
CountyPetersburg Census Area
StateAlaska
Coordinates56.80786, -132.97542
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.5 US tons
Inventory rating32 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel
DeckOpen grating
Main spans1 (+6 approach)
Design loadHS 20
Structure length500 ft (152.4 m)
Longest span140 ft (42.7 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic53 (2018)
Projected traffic100 by 2035
Trucks8%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a toll 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 Marine HWY Route over Petersburg Ferry Term built?

It was built in 1986, making it 39 years old in 2025.

What condition is Marine HWY Route over Petersburg Ferry Term 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 May 2023.

How much traffic does Marine HWY Route over Petersburg Ferry Term carry?

About 53 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is Marine HWY Route over Petersburg Ferry Term?

The structure is 500 ft (152.4 m) long with a longest span of 140 ft (42.7 m) and a deck 16 ft wide.

Who owns Marine HWY Route over Petersburg Ferry Term?

It is owned by the State Highway Agency.