Structure 623202600202191 · Livingston County, LA

La0016 over Colyell Bay

Carries La0016 over Colyell Bay, 2.0 Mi. E. Of La 42.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
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 FT680 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

680 ft end to end: about 1.9 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 multi-beam bridge.

Built197947 years old
Length680.1 ft207.3 m
Daily traffic6,743counted 2021
Last inspectedJanuary 2024every 24 months

Location

StateLouisiana
CountyLivingston
Location2.0 Mi. E. Of La 42
CarriesLa0016
CrossesColyell Bay
Coordinates30.32679, -90.82340

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length680.1 ft (207.3 m)
Max Span40.0 ft (12.2 m)
Deck Width43.0 ft (13.1 m)
Deck Area2715.6 sq m
Main Spans1
Year Built1979

Traffic

Avg Daily Traffic6,743 (2021)
Truck Traffic11%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number623202600202191

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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