US Bridges

County Road 4.5 over Brighton Ditch

Fair

Weld County, Colorado · 0.5 MI S of CO RD 6 · Structure no. WEL004.5-023.0A

Built
1999
26 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
25 ft
1 main span
Daily traffic
301
2022 count
Owner
County
County Highway Agency

About this bridge

County Road 4.5 over Brighton Ditch is a steel stringer/multi-beam or girder carrying County Road 4.5 over Brighton Ditch in Weld County, Colorado. It was built in 1999, so it is 26 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 301 vehicles a day, roughly 30% of them trucks, projected to reach 428 by 2042. The structure is 25 ft (7.6 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Road 4.5
CrossesBrighton Ditch
Location0.5 MI S of CO RD 6
RouteCounty Highway 0
CountyWeld County
StateColorado
Coordinates40.02227, -104.84821
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating35.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span21 ft (6.4 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic301 (2022)
Projected traffic428 by 2042
Trucks30%
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 4.5 over Brighton Ditch built?

It was built in 1999, making it 26 years old in 2025.

What condition is County Road 4.5 over Brighton Ditch 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 March 2024.

How much traffic does County Road 4.5 over Brighton Ditch carry?

About 301 vehicles per day (2022 count), of which roughly 30% are trucks.

How long is County Road 4.5 over Brighton Ditch?

The structure is 25 ft (7.6 m) long with a longest span of 21 ft (6.4 m) and a deck 32 ft wide.

Who owns County Road 4.5 over Brighton Ditch?

It is owned by the County Highway Agency.