Structure ERI001.0-010.0A · Boulder County, CO

County Road 1 over Coal Creek

Carries County Road 1 over Coal Creek, 300 Ft N Of Bixler BLVD.

Overall conditionFair

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

How ratings work
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
24 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck not ratedSuperstructure 6/9 · sets the ratingSubstructure 7/9

24 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. 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 rigid-frame bridge.

Built199630 years old
Length24.3 ft7.4 m
Daily traffic5,198counted 2023
Last inspectedFebruary 2024every 24 months

Location

StateColorado
CountyBoulder
Location300 Ft N Of Bixler BLVD
CarriesCounty Road 1
CrossesCoal Creek
Coordinates40.06328, -105.05542

Physical Characteristics

MaterialConcrete
DesignFrame
Total Length24.3 ft (7.4 m)
Max Span22.3 ft (6.8 m)
Deck Width35.4 ft (10.8 m)
Deck Area79.9 sq m
Main Spans1
Year Built1996

Traffic

Avg Daily Traffic5,198 (2023)
Truck Traffic15%
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2024
Inspection FrequencyEvery 24 months
OwnerTown/Township Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure NumberERI001.0-010.0A

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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