Structure 49003900.80009 · Grand County, CO

County Road 39 over Colorado River

Carries County Road 39 over Colorado River, 0.8 Mi So Of US HWY 40.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT120 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

120 ft end to end, longest span 40 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.

Built195373 years old
Length120.4 ft36.7 m
Daily traffic86counted 2023
Last inspectedSeptember 2023every 24 months

Location

StateColorado
CountyGrand
Location0.8 Mi So Of US HWY 40
CarriesCounty Road 39
CrossesColorado River
Coordinates40.05369, -106.28964

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length120.4 ft (36.7 m)
Max Span39.7 ft (12.1 m)
Deck Width20.0 ft (6.1 m)
Deck Area223.9 sq m
Main Spans3
Year Built1953

Traffic

Avg Daily Traffic86 (2023)
Truck Traffic25%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number49003900.80009

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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