US Bridges

Baseline Road (cr over South Boulder Creek

Fair

Boulder County, Colorado · 0.1 MI W of Cherryvale RD · Structure no. BC-56-0.5-SB

Built
1980
45 years old
Condition
Fair
inspected February 2025
Type
Tee Beam
Prestressed Concrete
Length
43 ft
1 main span
Daily traffic
4,986
2022 count
Owner
County
County Highway Agency

About this bridge

Baseline Road (cr over South Boulder Creek is a prestressed concrete tee beam carrying Baseline Road (cr over South Boulder Creek in Boulder County, Colorado. It was built in 1980, so it is 45 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 5 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 4,986 vehicles a day, roughly 3% of them trucks, projected to reach 5,983 by 2042. The structure is 43 ft (13.2 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesBaseline Road (cr
CrossesSouth Boulder Creek
Location0.1 MI W of Cherryvale RD
RouteCounty Highway 0
CountyBoulder County
StateColorado
Coordinates40.00006, -105.21553
Functional classUrban Minor 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
Deck8 Very GoodNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating54.1 US tons
Inventory rating38.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length43 ft (13.2 m)
Longest span38 ft (11.6 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,986 (2022)
Projected traffic5,983 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Baseline Road (cr over South Boulder Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Baseline Road (cr over South Boulder 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 February 2025.

How much traffic does Baseline Road (cr over South Boulder Creek carry?

About 4,986 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Baseline Road (cr over South Boulder Creek?

The structure is 43 ft (13.2 m) long with a longest span of 38 ft (11.6 m) and a deck 39 ft wide.

Who owns Baseline Road (cr over South Boulder Creek?

It is owned by the County Highway Agency.