Structure 100000030367010 · Baltimore County, MD

Md 158 over Mud Flats

Carries Md 158 over Mud Flats, 1.44 Mile West Of Md 151.

Overall conditionFair

Set by its lowest-rated component: Deck at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT852 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 6/9

852 ft end to end, longest span 78 ft: about 2.4 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.

Built1976rebuilt 1999
Length852.0 ft259.7 m
Daily traffic12,161counted 2009
Last inspectedJuly 2023every 24 months

Location

StateMaryland
CountyBaltimore
Location1.44 Mile West Of Md 151
CarriesMd 158
CrossesMud Flats
Coordinates39.23802, -76.47990

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length852.0 ft (259.7 m)
Max Span78.1 ft (23.8 m)
Deck Width58.1 ft (17.7 m)
Deck Area4596.7 sq m
Main Spans11
Year Built1976 (reconstructed 1999)

Traffic

Avg Daily Traffic12,161 (2009)
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number100000030367010

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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