Structure 31003020170181B · DeSoto County, MS

SR 302 over SR 178 Bnrr Ramp D Sr305

Carries SR 302 over SR 178 Bnrr Ramp D Sr305, 1.1 Mi E US 78.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,772 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 7/9

1,772 ft end to end, longest span 213 ft: about 4.9 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.

Built200125 years old
Length1771.7 ft540 m
Daily traffic15,000counted 2023
Last inspectedJune 2023every 24 months

Location

StateMississippi
CountyDeSoto
Location1.1 Mi E US 78
CarriesSR 302
CrossesSR 178 Bnrr Ramp D Sr305
Coordinates34.96703, -89.83545

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length1771.7 ft (540 m)
Max Span213.3 ft (65 m)
Deck Width42.3 ft (12.9 m)
Deck Area6,966 sq m
Main Spans12
Year Built2001

Traffic

Avg Daily Traffic15,000 (2023)
Truck Traffic10%
Lanes On Bridge2
Lanes Under Bridge10

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number31003020170181B

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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