US Bridges

SH 128 (120th Ave) over US 36 Ml

Fair

Broomfield County, Colorado · 120th Ave and US 36 · Structure no. E-16-XU

Built
2011
14 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
299 ft
2 main spans
Daily traffic
19,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 128 (120th Ave) over US 36 Ml is a prestressed concrete continuous stringer/multi-beam or girder carrying SH 128 (120th Ave) over US 36 Ml in Broomfield County, Colorado. It was built in 2011, so it is 14 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 19,000 vehicles a day, roughly 5% of them trucks, projected to reach 26,220 by 2040. The structure is 299 ft (91.2 m) long and 130 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 128 (120th Ave)
CrossesUS 36 Ml
Location120th Ave and US 36
RouteState Highway 128A
CountyBroomfield County
StateColorado
Coordinates39.91119, -105.08884
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans2
Design loadUnknown
Structure length299 ft (91.2 m)
Longest span149 ft (45.3 m)
Deck width130 ft (39.6 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,000 (2020)
Projected traffic26,220 by 2040
Trucks5%
Lanes on structure6
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

OwnerState Highway Agency
Maintained byState 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 SH 128 (120th Ave) over US 36 Ml built?

It was built in 2011, making it 14 years old in 2025.

What condition is SH 128 (120th Ave) over US 36 Ml 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 July 2024.

How much traffic does SH 128 (120th Ave) over US 36 Ml carry?

About 19,000 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SH 128 (120th Ave) over US 36 Ml?

The structure is 299 ft (91.2 m) long with a longest span of 149 ft (45.3 m) and a deck 130 ft wide.

Who owns SH 128 (120th Ave) over US 36 Ml?

It is owned by the State Highway Agency.