US Bridges

Mackenzie Ave. over Arkansas River

Fair

Fremont County, Colorado · .6 MI N of SH 115 · Structure no. FRCO 20-102

Built
1966
59 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
238 ft
3 main spans
Daily traffic
3,980
2022 count
Owner
County
County Highway Agency

About this bridge

Mackenzie Ave. over Arkansas River is a prestressed concrete stringer/multi-beam or girder carrying Mackenzie Ave. over Arkansas River in Fremont County, Colorado. It was built in 1966, so it is 59 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 3,980 vehicles a day, roughly 5% of them trucks, projected to reach 4,458 by 2042. The structure is 238 ft (72.6 m) long and 38 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesMackenzie Ave.
CrossesArkansas River
Location.6 MI N of SH 115
RouteCounty Highway 0
CountyFremont County
StateColorado
Coordinates38.42212, -105.17871
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating71 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length238 ft (72.6 m)
Longest span98 ft (29.9 m)
Deck width38 ft (11.5 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,980 (2022)
Projected traffic4,458 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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 Mackenzie Ave. over Arkansas River built?

It was built in 1966, making it 59 years old in 2025.

What condition is Mackenzie Ave. over Arkansas River 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 February 2025.

How much traffic does Mackenzie Ave. over Arkansas River carry?

About 3,980 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Mackenzie Ave. over Arkansas River?

The structure is 238 ft (72.6 m) long with a longest span of 98 ft (29.9 m) and a deck 38 ft wide.

Who owns Mackenzie Ave. over Arkansas River?

It is owned by the County Highway Agency.