US Bridges

Wiseman Road over Wiseman Bridge

FairPosted for load

Yukon-Koyukuk Census Area, Alaska · Mile Point 2.7 · Structure no. 1547

Built
1995
30 years old
Condition
Fair
inspected July 2024
Type
Truss - Thru
Steel
Length
83 ft
1 main span
Daily traffic
40
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Wiseman Road over Wiseman Bridge is a steel truss - thru carrying Wiseman Road over Wiseman Bridge in Yukon-Koyukuk Census Area, Alaska. It was built in 1995, so it is 30 years old, younger 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. Its operating status is: posted for load restriction.

It carries about 40 vehicles a day, roughly 1% of them trucks, projected to reach 60 by 2039. The structure is 83 ft (25.3 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesWiseman Road
CrossesWiseman Bridge
LocationMile Point 2.7
RouteCity Street 0
CountyYukon-Koyukuk Census Area
StateAlaska
Coordinates67.40987, -150.10774
Functional classRural Local

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.
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41 US tons
Inventory rating20.8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length83 ft (25.3 m)
Longest span80 ft (24.4 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2020)
Projected traffic60 by 2039
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Wiseman Road over Wiseman Bridge built?

It was built in 1995, making it 30 years old in 2025.

What condition is Wiseman Road over Wiseman Bridge 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 July 2024.

How much traffic does Wiseman Road over Wiseman Bridge carry?

About 40 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Wiseman Road over Wiseman Bridge?

The structure is 83 ft (25.3 m) long with a longest span of 80 ft (24.4 m) and a deck 14 ft wide.

Who owns Wiseman Road over Wiseman Bridge?

It is owned by the City or Municipal Highway Agency.