Structure CEPSWTOKCANTONL · Blaine County, OK

State Highway 58a over Canton Lake Spillway

Carries State Highway 58a over Canton Lake Spillway, 2 Mi N. Of Canton.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 4 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating4/9 · Poor
Substructure5/9 · Fair
Channelnot part of overall9/9 · Excellent
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT786 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 4/9 · sets the ratingSubstructure 5/9

786 ft end to end, longest span 43 ft: about 2.2 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 girder bridge.

Built1948rebuilt 2017
Length785.8 ft239.5 m
Daily traffic730counted 2024
Last inspectedMarch 2024every 24 months

Location

StateOklahoma
CountyBlaine
Location2 Mi N. Of Canton
CarriesState Highway 58a
CrossesCanton Lake Spillway
Coordinates36.08171, -98.60235

Physical Characteristics

MaterialConcrete
DesignGirder and Floorbeam
Total Length785.8 ft (239.5 m)
Max Span43.0 ft (13.1 m)
Deck Width29.9 ft (9.1 m)
Deck Area2179.4 sq m
Main Spans16
Year Built1948 (reconstructed 2017)

Traffic

Avg Daily Traffic730 (2024)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerCorps of Engineers
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure NumberCEPSWTOKCANTONL

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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