Structure CGP · Uinta County, WY

Wyo 411 over Blacks Fork River

Carries Wyo 411 over Blacks Fork River, Mountain View - Milburne.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
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
SEMI-TRUCK · 72 FT140 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

140 ft end to end, longest span 54 ft. 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.

Built196660 years old
Length140.1 ft42.7 m
Daily traffic763counted 2024
Last inspectedJuly 2023every 24 months

Location

StateWyoming
CountyUinta
LocationMountain View - Milburne
CarriesWyo 411
CrossesBlacks Fork River
Coordinates41.26535, -110.40551

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length140.1 ft (42.7 m)
Max Span54.1 ft (16.5 m)
Deck Width31.2 ft (9.5 m)
Deck Area405.6 sq m
Main Spans3
Year Built1966

Traffic

Avg Daily Traffic763 (2024)
Truck Traffic13%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure NumberCGP

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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