Structure 27 0089 · Marin County, CA

U.s. Highway 101 over Novato Creek

Carries U.s. Highway 101 over Novato Creek, 04-mrn-101-r20.51-nvto.

Overall conditionPoor

Set by its lowest-rated component: Deck at 4 of 9.

How ratings work
Decksets the rating4/9 · Poor
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT192 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 7/9Substructure 7/9

192 ft end to end, longest span 38 ft: about 3 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 tee-beam bridge.

Built1974rebuilt 2014
Length191.9 ft58.5 m
Daily traffic61,500counted 2009
Last inspectedJune 2023every 24 months

Location

StateCalifornia
CountyMarin
Location04-mrn-101-r20.51-nvto
CarriesU.s. Highway 101
CrossesNovato Creek
Coordinates38.09639, -122.56135

Physical Characteristics

MaterialConcrete Continuous
DesignTee Beam
Total Length191.9 ft (58.5 m)
Max Span38.1 ft (11.6 m)
Deck Width158.1 ft (48.2 m)
Deck Area2819.7 sq m
Main Spans5
Year Built1974 (reconstructed 2014)

Traffic

Avg Daily Traffic61,500 (2009)
Truck Traffic5%
Lanes On Bridge8

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number27 0089

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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