Structure 1143 · Denali County, AK

Parks Highway over Nenana River At Moody

Carries Parks Highway over Nenana River At Moody, Mile Point 207.3.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure and Substructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT891 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 6/9

891 ft end to end, longest span 315 ft: about 2.5 football fields. 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 deck truss.

Built197056 years old
Length891.1 ft271.6 m
Daily traffic1,380counted 2020
Last inspectedJuly 2024every 24 months

Location

StateAlaska
CountyDenali
LocationMile Point 207.3
CarriesParks Highway
CrossesNenana River At Moody
Coordinates63.80268, -148.93295

Physical Characteristics

MaterialSteel
DesignTruss - Deck
Total Length891.1 ft (271.6 m)
Max Span315.0 ft (96 m)
Deck Width34.1 ft (10.4 m)
Deck Area2824.6 sq m
Main Spans3
Year Built1970

Traffic

Avg Daily Traffic1,380 (2020)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical9 — Foundation above flood level
Structure Number1143

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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