US Bridges

CO Road 105 | S Pe over Oakland School Gulch

Fair

Douglas County, Colorado · 0.1 MI S Wolfensberger RD · Structure no. DOU105-23.50A

Built
1990
35 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
103 ft
1 main span
Daily traffic
4,343
2021 count
Owner
County
County Highway Agency

About this bridge

CO Road 105 | S Pe over Oakland School Gulch is a prestressed concrete stringer/multi-beam or girder carrying CO Road 105 | S Pe over Oakland School Gulch in Douglas County, Colorado. It was built in 1990, so it is 35 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 4,343 vehicles a day, roughly 9% of them trucks, projected to reach 5,819 by 2041. The structure is 103 ft (31.5 m) long and 39 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesCO Road 105 | S Pe
CrossesOakland School Gulch
Location0.1 MI S Wolfensberger RD
RouteCounty Highway 0
Coordinates39.36959, -104.95647
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.8 US tons
Inventory rating40.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length103 ft (31.5 m)
Longest span97 ft (29.7 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,343 (2021)
Projected traffic5,819 by 2041
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 CO Road 105 | S Pe over Oakland School Gulch built?

It was built in 1990, making it 35 years old in 2025.

What condition is CO Road 105 | S Pe over Oakland School Gulch 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 February 2025.

How much traffic does CO Road 105 | S Pe over Oakland School Gulch carry?

About 4,343 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is CO Road 105 | S Pe over Oakland School Gulch?

The structure is 103 ft (31.5 m) long with a longest span of 97 ft (29.7 m) and a deck 39 ft wide.

Who owns CO Road 105 | S Pe over Oakland School Gulch?

It is owned by the County Highway Agency.