US Bridges

County Road 28 over South Platte River

Fair

Weld County, Colorado · 0.7 MI E of CO RD 23 · Structure no. WEL028.0-023.0A

Built
1965
60 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
344 ft
7 main spans
Daily traffic
1,008
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 28 over South Platte River is a prestressed concrete tee beam carrying County Road 28 over South Platte River in Weld County, Colorado. It was built in 1965, so it is 60 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 1,008 vehicles a day, roughly 37% of them trucks, projected to reach 1,431 by 2042. The structure is 344 ft (104.9 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCounty Road 28
CrossesSouth Platte River
Location0.7 MI E of CO RD 23
RouteCounty Highway 0
CountyWeld County
StateColorado
Coordinates40.18834, -104.82985
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
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 rating40 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length344 ft (104.9 m)
Longest span48 ft (14.5 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,008 (2022)
Projected traffic1,431 by 2042
Trucks37%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 28 over South Platte River built?

It was built in 1965, making it 60 years old in 2025.

What condition is County Road 28 over South Platte River 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 June 2024.

How much traffic does County Road 28 over South Platte River carry?

About 1,008 vehicles per day (2022 count), of which roughly 37% are trucks.

How long is County Road 28 over South Platte River?

The structure is 344 ft (104.9 m) long with a longest span of 48 ft (14.5 m) and a deck 32 ft wide.

Who owns County Road 28 over South Platte River?

It is owned by the County Highway Agency.