Structure 19460 · Twin Falls County, ID

Stc2744;3700 N. RD over Snake R.;n.murtaugh Br.

Carries Stc2744;3700 N. RD over Snake R.;n.murtaugh Br., 0.5 N. 0.5 E. Murtaugh.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
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 FT289 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

289 ft end to end, longest span 150 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 multi-beam bridge.

Built198343 years old
Length289.0 ft88.1 m
Daily traffic300counted 2023
Last inspectedFebruary 2023every 48 months

Location

StateIdaho
CountyTwin Falls
Location0.5 N. 0.5 E. Murtaugh
CarriesStc2744;3700 N. RD
CrossesSnake R.;n.murtaugh Br.
Coordinates42.49925, -114.15389

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length289.0 ft (88.1 m)
Max Span149.9 ft (45.7 m)
Deck Width33.8 ft (10.3 m)
Deck Area907.4 sq m
Main Spans2
Year Built1983

Traffic

Avg Daily Traffic300 (2023)
Truck Traffic20%
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2023
Inspection FrequencyEvery 48 months
OwnerOther Local Agencies
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number000000000019460

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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