Structure 39 0007R · Merced County, CA

State Route 99 NB over Miles Creek

Carries State Route 99 NB over Miles Creek, 10-mer-099-10.83.

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 overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT103 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

103 ft end to end, longest span 34 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 slab bridge.

Built200818 years old
Length102.7 ft31.3 m
Daily traffic19,500counted 2009
Last inspectedApril 2024every 48 months

Location

StateCalifornia
CountyMerced
Location10-mer-099-10.83
CarriesState Route 99 NB
CrossesMiles Creek
Coordinates37.26491, -120.42771

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length102.7 ft (31.3 m)
Max Span34.4 ft (10.5 m)
Deck Width58.1 ft (17.7 m)
Deck Area554.0 sq m
Main Spans3
Year Built2008

Traffic

Avg Daily Traffic19,500 (2009)
Lanes On Bridge3

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number39 0007R

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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