US Bridges

I 70 Ml over Lewis Gulch

Fair

Mesa County, Colorado · 3.4 MI E of Exit 31/HORIZ · Structure no. H-03-BF

Built
1964
61 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
22,000
2022 count
Owner
State
State Highway Agency

About this bridge

I 70 Ml over Lewis Gulch is a concrete culvert carrying I 70 Ml over Lewis Gulch in Mesa County, Colorado. It was built in 1964, so it is 61 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 22,000 vehicles a day, roughly 13% of them trucks, projected to reach 29,700 by 2042. The structure is 21 ft (6.4 m) long and 235 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesI 70 Ml
CrossesLewis Gulch
Location3.4 MI E of Exit 31/HORIZ
RouteInterstate 70A
Coordinates39.10507, -108.48147
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating80.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width235 ft (71.6 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,000 (2022)
Projected traffic29,700 by 2042
Trucks13%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 70 Ml over Lewis Gulch built?

It was built in 1964, making it 61 years old in 2025.

What condition is I 70 Ml over Lewis Gulch 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 I 70 Ml over Lewis Gulch carry?

About 22,000 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is I 70 Ml over Lewis Gulch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 235 ft wide.

Who owns I 70 Ml over Lewis Gulch?

It is owned by the State Highway Agency.