US Bridges

Road over Stream

Good

Petersburg Census Area, Alaska · Kupreanof Island Portage · Structure no. 100521000003318

Built
1996
29 years old
Condition
Good
inspected August 2021
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
—
2006 count
Owner
Federal
U.S. Forest Service

About this bridge

Road over Stream is a steel stringer/multi-beam or girder carrying Road over Stream in Petersburg Census Area, Alaska. It was built in 1996, so it is 29 years old, younger 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.

No traffic count is recorded. The structure is 60 ft (18.3 m) long and 18 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesRoad
CrossesStream
LocationKupreanof Island Portage
RouteFederal Lands Road 6031
StateAlaska
Coordinates57.00032, -133.44455
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than 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 rating46.7 US tons
Inventory rating36 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadOther
Structure length60 ft (18.3 m)
Longest span58 ft (17.8 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic—
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road over Stream built?

It was built in 1996, making it 29 years old in 2025.

What condition is Road over Stream 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 August 2021.

How much traffic does Road over Stream carry?

No traffic count is recorded for this structure.

How long is Road over Stream?

The structure is 60 ft (18.3 m) long with a longest span of 58 ft (17.8 m) and a deck 18 ft wide.

Who owns Road over Stream?

It is owned by the U.S. Forest Service.