Structure 28C0269 · Contra Costa County, CA

Brentwood BLVD over Marsh Creek

Carries Brentwood BLVD over Marsh Creek, 0.1 M N/o Kayla Pl.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT82 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

82 ft end to end, longest span 30 ft. Lengths and the car 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.

Built1928rebuilt 1977
Length82.0 ft25 m
Daily traffic17,900counted 2020
Last inspectedJanuary 2025every 24 months

Location

StateCalifornia
CountyContra Costa
Location0.1 M N/o Kayla Pl
CarriesBrentwood BLVD
CrossesMarsh Creek
Coordinates37.95268, -121.69602

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length82.0 ft (25 m)
Max Span29.9 ft (9.1 m)
Deck Width47.6 ft (14.5 m)
Deck Area362.5 sq m
Main Spans3
Year Built1928 (reconstructed 1977)

Traffic

Avg Daily Traffic17,900 (2020)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2025
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number28C0269

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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