Structure 27800 · Elmore County, ID

Morrow Reservoir R over Little Canyon Creek

Carries Morrow Reservoir R over Little Canyon Creek, 1.9n 0.4w Glenns Ferry.

Overall conditionPoor

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

How ratings work
Deck7/9 · Good
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT51 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9Substructure 4/9 · sets the rating

51 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.

Built1970rebuilt 1984
Length50.9 ft15.5 m
Daily traffic170counted 2023
Last inspectedMarch 2024every 24 months

Location

StateIdaho
CountyElmore
Location1.9n 0.4w Glenns Ferry
CarriesMorrow Reservoir R
CrossesLittle Canyon Creek
Coordinates42.98174, -115.30791

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length50.9 ft (15.5 m)
Max Span48.9 ft (14.9 m)
Deck Width18.0 ft (5.5 m)
Deck Area85.2 sq m
Main Spans1
Year Built1970 (reconstructed 1984)

Traffic

Avg Daily Traffic170 (2023)
Lanes On Bridge1

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerOther Local Agencies
Historical SignificanceHistorical significance is not determined
Scour CriticalUnknown
Structure Number000000000027800

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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