US Bridges

County Road 137/N. over I 70 Ml

Poor

Arapahoe County, Colorado · 1 MI E of JCT SH 79 · Structure no. F-19-AF

Built
1959
66 years old
Condition
Poor
inspected April 2024
Type
Tee Beam
Concrete Continuous
Length
228 ft
4 main spans
Daily traffic
2,326
2024 count
Owner
State
State Highway Agency

About this bridge

County Road 137/N. over I 70 Ml is a concrete continuous tee beam carrying County Road 137/N. over I 70 Ml in Arapahoe County, Colorado. It was built in 1959, so it is 66 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,326 vehicles a day, roughly 22% of them trucks, projected to reach 3,024 by 2044. The structure is 228 ft (69.5 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Road 137/N.
CrossesI 70 Ml
Location1 MI E of JCT SH 79
RouteCounty Highway 0
CountyArapahoe County
StateColorado
Coordinates39.73788, -104.41449
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.4 US tons
Inventory rating45.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckOther
Main spans4
Design loadHS 20 + Mod
Structure length228 ft (69.5 m)
Longest span65 ft (19.8 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,326 (2024)
Projected traffic3,024 by 2044
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 County Road 137/N. over I 70 Ml built?

It was built in 1959, making it 66 years old in 2025.

What condition is County Road 137/N. over I 70 Ml in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.

How much traffic does County Road 137/N. over I 70 Ml carry?

About 2,326 vehicles per day (2024 count), of which roughly 22% are trucks.

How long is County Road 137/N. over I 70 Ml?

The structure is 228 ft (69.5 m) long with a longest span of 65 ft (19.8 m) and a deck 32 ft wide.

Who owns County Road 137/N. over I 70 Ml?

It is owned by the State Highway Agency.