US Bridges

County Road 128E over North Boulder Creek

Fair

Boulder County, Colorado · 3.9 MI E of ST HWY 72 · Structure no. BC-128E-3.9-NB1

Built
1994
31 years old
Condition
Fair
inspected January 2025
Type
Frame
Concrete
Length
34 ft
1 main span
Daily traffic
80
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 128E over North Boulder Creek is a concrete frame carrying County Road 128E over North Boulder Creek in Boulder County, Colorado. It was built in 1994, so it is 31 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 80 vehicles a day, roughly 16% of them trucks, projected to reach 96 by 2043. The structure is 34 ft (10.5 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 128E
CrossesNorth Boulder Creek
Location3.9 MI E of ST HWY 72
RouteCounty Highway 0
CountyBoulder County
StateColorado
Coordinates39.98916, -105.47179
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating83.2 US tons
Inventory rating49.9 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckOther
Main spans1
Design loadHS 20
Structure length34 ft (10.5 m)
Longest span32 ft (9.9 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2023)
Projected traffic96 by 2043
Trucks16%
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 128E over North Boulder Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is County Road 128E over North 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 January 2025.

How much traffic does County Road 128E over North Boulder Creek carry?

About 80 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is County Road 128E over North Boulder Creek?

The structure is 34 ft (10.5 m) long with a longest span of 32 ft (9.9 m) and a deck 29 ft wide.

Who owns County Road 128E over North Boulder Creek?

It is owned by the County Highway Agency.