Structure 2253 · Anchorage County, AK

Seward Highway over 76th AVE Undercrossing

Carries Seward Highway over 76th AVE Undercrossing, Mile Point 121.8.

Overall conditionGood

Set by its lowest-rated component: Substructure at 8 of 9.

How ratings work
Deck9/9 · Excellent
Superstructure9/9 · Excellent
Substructuresets the rating8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT133 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 9/9Superstructure 9/9Substructure 8/9 · sets the rating

133 ft end to end. Lengths and the semi-truck 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.

Built20179 years old
Length132.9 ft40.5 m
Daily traffic41,300counted 2020
Last inspectedJune 2023every 24 months

Location

StateAlaska
CountyAnchorage
LocationMile Point 121.8
CarriesSeward Highway
Crosses76th AVE Undercrossing
Coordinates61.15198, -149.85591

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length132.9 ft (40.5 m)
Max Span129.9 ft (39.6 m)
Deck Width140.4 ft (42.8 m)
Deck Area1733.4 sq m
Main Spans1
Year Built2017

Traffic

Avg Daily Traffic41,300 (2020)
Truck Traffic2%
Lanes On Bridge6
Lanes Under 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 Number2253

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.

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