Structure 2 0158L · Siskiyou County, CA

Interstate 5 SB over Miner Street

Carries Interstate 5 SB over Miner Street, 02-sis-005-r47.56-yre.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT117 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 5/9 · sets the rating

117 ft end to end. 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 box-beam bridge.

Built197056 years old
Length116.8 ft35.6 m
Daily traffic8,300counted 2015
Last inspectedJanuary 2024every 24 months

Location

StateCalifornia
CountySiskiyou
Location02-sis-005-r47.56-yre
CarriesInterstate 5 SB
CrossesMiner Street
Coordinates41.73072, -122.63317

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length116.8 ft (35.6 m)
Max Span116.8 ft (35.6 m)
Deck Width41.0 ft (12.5 m)
Deck Area445 sq m
Main Spans1
Year Built1970

Traffic

Avg Daily Traffic8,300 (2015)
Truck Traffic25%
Lanes On Bridge2
Lanes Under Bridge3

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number02 0158L

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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