US Bridges

SH 9 Ml over Platte Gulch

Good

Park County, Colorado · 6.8 MI N. of JCT U.S. 285 · Structure no. G-12-U

Built
2023
2 years old
Condition
Good
inspected November 2023
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
35 ft
2 main spans
Daily traffic
4,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 9 Ml over Platte Gulch is a aluminum, wrought iron, or cast iron culvert carrying SH 9 Ml over Platte Gulch in Park County, Colorado. It was built in 2023, so it is 2 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,000 vehicles a day, roughly 4% of them trucks, projected to reach 5,400 by 2040. The structure is 35 ft (10.6 m) long and 52 ft wide. If it were closed, the detour would be 70.2 mi (113 km).

CarriesSH 9 Ml
CrossesPlatte Gulch
Location6.8 MI N. of JCT U.S. 285
RouteState Highway 9C
Coordinates39.29482, -106.06555
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating52.1 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans2
Design loadHL 93
Structure length35 ft (10.6 m)
Longest span35 ft (10.6 m)
Deck width52 ft (15.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2020)
Projected traffic5,400 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed70.2 mi (113 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 9 Ml over Platte Gulch built?

It was built in 2023, making it 2 years old in 2025.

What condition is SH 9 Ml over Platte Gulch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does SH 9 Ml over Platte Gulch carry?

About 4,000 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is SH 9 Ml over Platte Gulch?

The structure is 35 ft (10.6 m) long with a longest span of 35 ft (10.6 m) and a deck 52 ft wide.

Who owns SH 9 Ml over Platte Gulch?

It is owned by the State Highway Agency.