Structure 38C0002 · Stanislaus County, CA

Mchenry Avenue over Dry Slough

Carries Mchenry Avenue over Dry Slough, 1.7 Mi N State Route 108.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT349 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

349 ft end to end, longest span 26 ft: about 5 semi-trucks nose to tail. 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.

Built196264 years old
Length349.1 ft106.4 m
Daily traffic11,442counted 2017
Last inspectedAugust 2023every 24 months

Location

StateCalifornia
CountyStanislaus
Location1.7 Mi N State Route 108
CarriesMchenry Avenue
CrossesDry Slough
Coordinates37.75569, -120.99562

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length349.1 ft (106.4 m)
Max Span25.9 ft (7.9 m)
Deck Width32.2 ft (9.8 m)
Deck Area1042.7 sq m
Main Spans14
Year Built1962

Traffic

Avg Daily Traffic11,442 (2017)
Truck Traffic26%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number38C0002

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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