Structure 1950 · Anchorage County, AK

Seward Highway over Bird Point Overhead

Carries Seward Highway over Bird Point Overhead, Mile Point 95.3.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT109 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

109 ft end to end. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a tee-beam bridge.

Built199828 years old
Length108.6 ft33.1 m
Daily traffic6,660counted 2020
Last inspectedJune 2023every 24 months

Location

StateAlaska
CountyAnchorage
LocationMile Point 95.3
CarriesSeward Highway
CrossesBird Point Overhead
Coordinates60.92972, -149.34194

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length108.6 ft (33.1 m)
Max Span104.3 ft (31.8 m)
Deck Width44.0 ft (13.4 m)
Deck Area443.5 sq m
Main Spans1
Year Built1998

Traffic

Avg Daily Traffic6,660 (2020)
Truck Traffic8%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number1950

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.