US Bridges

Sand Point Road over Humbolt Slough

Poor

Aleutians East Borough, Alaska · Sand Point · Structure no. 1972

Built
1998
27 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
90 ft
1 main span
Daily traffic
75
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sand Point Road over Humbolt Slough is a steel stringer/multi-beam or girder carrying Sand Point Road over Humbolt Slough in Aleutians East Borough, Alaska. It was built in 1998, so it is 27 years old, younger than the Alaska average of 35.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 75 vehicles a day, roughly 6% of them trucks, projected to reach 120 by 2035. The structure is 90 ft (27.4 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesSand Point Road
CrossesHumbolt Slough
LocationSand Point
RouteCity Street 0
StateAlaska
Coordinates55.33633, -160.49649
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating83.4 US tons
Inventory rating31.5 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span85 ft (25.9 m)
Deck width32 ft (9.8 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2018)
Projected traffic120 by 2035
Trucks6%
Lanes on structure2
Traffic directionTwo-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 Sand Point Road over Humbolt Slough built?

It was built in 1998, making it 27 years old in 2025.

What condition is Sand Point Road over Humbolt Slough in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Sand Point Road over Humbolt Slough carry?

About 75 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is Sand Point Road over Humbolt Slough?

The structure is 90 ft (27.4 m) long with a longest span of 85 ft (25.9 m) and a deck 32 ft wide.

Who owns Sand Point Road over Humbolt Slough?

It is owned by the City or Municipal Highway Agency.