Structure TP-18-C · Las Animas County, CO

Animas ST over Purgatoire River

Carries Animas ST over Purgatoire River, Btw Nevada AVE &modic.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
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 FT225 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 6/9

225 ft end to end, longest span 71 ft: about 3 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 tee-beam bridge.

Built196264 years old
Length225.1 ft68.6 m
Daily traffic2,088counted 2022
Last inspectedJune 2023every 24 months

Location

StateColorado
CountyLas Animas
LocationBtw Nevada AVE &modic
CarriesAnimas ST
CrossesPurgatoire River
Coordinates37.16906, -104.50959

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length225.1 ft (68.6 m)
Max Span70.9 ft (21.6 m)
Deck Width36.7 ft (11.2 m)
Deck Area768.3 sq m
Main Spans3
Year Built1962

Traffic

Avg Daily Traffic2,088 (2022)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure NumberTP-18-C

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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