US Bridges

20th Street over Platte Street

Fair

Denver County, Colorado · 20th ST over Platte ST · Structure no. D-03-V-054

Built
1994
31 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Steel
Length
70 ft
1 main span
Daily traffic
18,893
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

20th Street over Platte Street is a steel box beam or girders - single or spread carrying 20th Street over Platte Street in Denver 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 18,893 vehicles a day, roughly 5% of them trucks, projected to reach 20,971 by 2041. The structure is 70 ft (21.2 m) long and 114 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries20th Street
CrossesPlatte Street
Location20th ST over Platte ST
RouteCity Street 0
Coordinates39.76075, -105.00347
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.9 US tons
Inventory rating55.6 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length70 ft (21.2 m)
Longest span54 ft (16.6 m)
Deck width114 ft (34.6 m)
Roadway width74 ft (22.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,893 (2021)
Projected traffic20,971 by 2041
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 20th Street over Platte Street built?

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

What condition is 20th Street over Platte Street 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 October 2024.

How much traffic does 20th Street over Platte Street carry?

About 18,893 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is 20th Street over Platte Street?

The structure is 70 ft (21.2 m) long with a longest span of 54 ft (16.6 m) and a deck 114 ft wide.

Who owns 20th Street over Platte Street?

It is owned by the City or Municipal Highway Agency.