Structure H-13-M · Park County, CO

US 24 Ml over Middle Fk S.platte Rvr

Carries US 24 Ml over Middle Fk S.platte Rvr, 2.2 Mi S.e. Of Jct SH 9 E.

Overall conditionPoor

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating4/9 · Poor
Substructure5/9 · Fair
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT117 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 4/9 · sets the ratingSubstructure 5/9

117 ft end to end, longest span 23 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.

Built193789 years old
Length117.1 ft35.7 m
Daily traffic3,300counted 2020
Last inspectedDecember 2024every 12 months

Location

StateColorado
CountyPark
Location2.2 Mi S.e. Of Jct SH 9 E
CarriesUS 24 Ml
CrossesMiddle Fk S.platte Rvr
Coordinates39.02861, -105.77389

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length117.1 ft (35.7 m)
Max Span23.0 ft (7 m)
Deck Width29.9 ft (9.1 m)
Deck Area324.9 sq m
Main Spans5
Year Built1937

Traffic

Avg Daily Traffic3,300 (2020)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionDecember 2024
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical5 — Stable for scour
Structure NumberH-13-M

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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