US Bridges

SH83 Ml over Unnamed Drainage

Fair

Douglas County, Colorado · 6.3 MI N of JCT SH86 · Structure no. G-17-BO

Built
1962
63 years old, rebuilt 1998
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
36,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH83 Ml over Unnamed Drainage is a concrete culvert carrying SH83 Ml over Unnamed Drainage in Douglas County, Colorado. It was built in 1962 and reconstructed in 1998, so it is 63 years old, older 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 36,000 vehicles a day, roughly 4% of them trucks, projected to reach 45,360 by 2040. The structure is 24 ft (7.2 m) long and 338 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesSH83 Ml
CrossesUnnamed Drainage
Location6.3 MI N of JCT SH86
RouteState Highway 83A
Coordinates39.47991, -104.75779
Functional classUrban Other Principal Arterial

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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.2 US tons
Inventory rating61.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length24 ft (7.2 m)
Longest span24 ft (7.2 m)
Deck width338 ft (102.9 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,000 (2020)
Projected traffic45,360 by 2040
Trucks4%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 SH83 Ml over Unnamed Drainage built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1998.

What condition is SH83 Ml over Unnamed Drainage 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 May 2023.

How much traffic does SH83 Ml over Unnamed Drainage carry?

About 36,000 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is SH83 Ml over Unnamed Drainage?

The structure is 24 ft (7.2 m) long with a longest span of 24 ft (7.2 m) and a deck 338 ft wide.

Who owns SH83 Ml over Unnamed Drainage?

It is owned by the State Highway Agency.