Structure 25375 · Twin Falls County, ID

3425 North Road over Dry Creek

Carries 3425 North Road over Dry Creek, 0.9 E. Murtaugh.

Overall conditionFair

Set by its lowest-rated component: Deck and Substructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT78 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

78 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 tee-beam bridge.

Built196561 years old
Length78.1 ft23.8 m
Daily traffic100counted 2023
Last inspectedFebruary 2023every 24 months

Location

StateIdaho
CountyTwin Falls
Location0.9 E. Murtaugh
Carries3425 North Road
CrossesDry Creek
Coordinates42.49233, -114.14381

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length78.1 ft (23.8 m)
Max Span77.1 ft (23.5 m)
Deck Width28.2 ft (8.6 m)
Deck Area204.7 sq m
Main Spans1
Year Built1965

Traffic

Avg Daily Traffic100 (2023)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2023
Inspection FrequencyEvery 24 months
OwnerOther Local Agencies
Historical SignificanceHistorical significance is not determined
Scour Critical9 — Foundation above flood level
Structure Number000000000025375

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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