US Bridges

Spring Drive over Davidson Ditch

Good

Boulder County, Colorado · 0.7 MI S of S. Boulder RD · Structure no. BC-O-OST-7C

Built
1970
55 years old
Condition
Good
inspected February 2025
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
1,022
2023 count
Owner
County
County Highway Agency

About this bridge

Spring Drive over Davidson Ditch is a concrete slab carrying Spring Drive over Davidson Ditch in Boulder County, Colorado. It was built in 1970, so it is 55 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,022 vehicles a day, roughly 9% of them trucks, projected to reach 1,227 by 2043. The structure is 25 ft (7.6 m) long and 33 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSpring Drive
CrossesDavidson Ditch
Location0.7 MI S of S. Boulder RD
RouteCounty Highway 0
Coordinates39.97723, -105.17621
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span23 ft (6.9 m)
Deck width33 ft (10.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,022 (2023)
Projected traffic1,227 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Spring Drive over Davidson Ditch built?

It was built in 1970, making it 55 years old in 2025.

What condition is Spring Drive over Davidson Ditch 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 February 2025.

How much traffic does Spring Drive over Davidson Ditch carry?

About 1,022 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Spring Drive over Davidson Ditch?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (6.9 m) and a deck 33 ft wide.

Who owns Spring Drive over Davidson Ditch?

It is owned by the County Highway Agency.