Structure 1 0046 · Del Norte County, CA

U.s. Highway 101 over Smith River Overflow

Carries U.s. Highway 101 over Smith River Overflow, 01-dn-101-35.77.

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
SEMI-TRUCK · 72 FT283 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

283 ft end to end, longest span 28 ft: about 4 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.

Built1955rebuilt 2007
Length283.1 ft86.3 m
Daily traffic6,700counted 2009
Last inspectedAugust 2021every 48 months

Location

StateCalifornia
CountyDel Norte
Location01-dn-101-35.77
CarriesU.s. Highway 101
CrossesSmith River Overflow
Coordinates41.87381, -124.13839

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length283.1 ft (86.3 m)
Max Span27.9 ft (8.5 m)
Deck Width49.9 ft (15.2 m)
Deck Area1311.8 sq m
Main Spans10
Year Built1955 (reconstructed 2007)

Traffic

Avg Daily Traffic6,700 (2009)
Truck Traffic6%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2021
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number01 0046

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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