Structure 21308000001003 · La Plata County, CO

Fdr 597 over Florida River

Carries Fdr 597 over Florida River, 16.5 Mi NE Of Durango.

Overall conditionGood

Set by its lowest-rated component: Substructure at 7 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT43 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

43 ft end to end, longest span 21 ft. 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 multi-beam bridge.

Built1949rebuilt 2000
Length43.0 ft13.1 m
Daily traffic84counted 2003
Last inspectedJuly 2023every 24 months

Location

StateColorado
CountyLa Plata
Location16.5 Mi NE Of Durango
CarriesFdr 597
CrossesFlorida River
Coordinates37.45393, -107.68206

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length43.0 ft (13.1 m)
Max Span21.0 ft (6.4 m)
Deck Width16.4 ft (5 m)
Deck Area65.5 sq m
Main Spans2
Year Built1949 (reconstructed 2000)

Traffic

Avg Daily Traffic84 (2003)
Lanes On Bridge1

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical4 — Foundations need monitoring
Structure Number021308000001003

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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