US Bridges

SH 470 Ml over Willow Creek

Fair

Douglas County, Colorado · 1.5 MI W of JCT I 25 · Structure no. F-17-IC

Built
1984
41 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
49 ft
3 main spans
Daily traffic
95,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 470 Ml over Willow Creek is a concrete culvert carrying SH 470 Ml over Willow Creek in Douglas County, Colorado. It was built in 1984, so it is 41 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 95,000 vehicles a day, roughly 2% of them trucks, projected to reach 126,350 by 2040. The structure is 49 ft (14.9 m) long and 239 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSH 470 Ml
CrossesWillow Creek
Location1.5 MI W of JCT I 25
RouteState Highway 470A
Coordinates39.56308, -104.88788
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length49 ft (14.9 m)
Longest span16 ft (4.8 m)
Deck width239 ft (72.9 m)
Roadway width172 ft (52.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic95,000 (2020)
Projected traffic126,350 by 2040
Trucks2%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 470 Ml over Willow Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is SH 470 Ml over Willow Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does SH 470 Ml over Willow Creek carry?

About 95,000 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is SH 470 Ml over Willow Creek?

The structure is 49 ft (14.9 m) long with a longest span of 16 ft (4.8 m) and a deck 239 ft wide.

Who owns SH 470 Ml over Willow Creek?

It is owned by the State Highway Agency.