US Bridges

Irr:kasaan Road over Tolstoi Creek No. 1

Good

Prince of Wales-Hyder Census Area, Alaska · Mile Point 11.9 · Structure no. 1893

Built
1996
29 years old
Condition
Good
inspected July 2023
Type
Truss - Thru
Steel
Length
84 ft
1 main span
Daily traffic
70
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Irr:kasaan Road over Tolstoi Creek No. 1 is a steel truss - thru carrying Irr:kasaan Road over Tolstoi Creek No. 1 in Prince of Wales-Hyder 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.

It carries about 70 vehicles a day, roughly 7% of them trucks, projected to reach 100 by 2035. The structure is 84 ft (25.6 m) long and 13 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesIrr:kasaan Road
CrossesTolstoi Creek No. 1
LocationMile Point 11.9
CountyPrince of Wales-Hyder Census Area
StateAlaska
Coordinates55.5865, -132.4486
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation8: Equal to present desirable 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 alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating77.2 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length84 ft (25.6 m)
Longest span80 ft (24.4 m)
Deck width13 ft (4.1 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2018)
Projected traffic100 by 2035
Trucks7%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
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 Irr:kasaan Road over Tolstoi Creek No. 1 built?

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

What condition is Irr:kasaan Road over Tolstoi Creek No. 1 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 July 2023.

How much traffic does Irr:kasaan Road over Tolstoi Creek No. 1 carry?

About 70 vehicles per day (2018 count), of which roughly 7% are trucks.

How long is Irr:kasaan Road over Tolstoi Creek No. 1?

The structure is 84 ft (25.6 m) long with a longest span of 80 ft (24.4 m) and a deck 13 ft wide.

Who owns Irr:kasaan Road over Tolstoi Creek No. 1?

It is owned by the City or Municipal Highway Agency.