Structure 560011 · Liberty County, FL

CR 368 over Porter Lake Relief

Carries CR 368 over Porter Lake Relief, 2.4 Miles East Of CR 67.

Overall conditionPoor

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

How ratings work
Deck5/9 · Fair
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT120 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 4/9 · sets the rating

120 ft end to end, longest span 20 ft. 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 slab bridge.

Built1964rebuilt 1984
Length120.1 ft36.6 m
Daily traffic250counted 2023
Last inspectedSeptember 2024every 24 months

Location

StateFlorida
CountyLiberty
Location2.4 Miles East Of CR 67
CarriesCR 368
CrossesPorter Lake Relief
Coordinates30.17751, -84.68142

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length120.1 ft (36.6 m)
Max Span20.0 ft (6.1 m)
Deck Width36.4 ft (11.1 m)
Deck Area406.3 sq m
Main Spans6
Year Built1964 (reconstructed 1984)

Traffic

Avg Daily Traffic250 (2023)
Truck Traffic2%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical4 — Foundations need monitoring
Structure Number560011

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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