US Bridges

SH 74 Ml over Kerr Gulch

Fair

Jefferson County, Colorado · 0.8 MI E of Kittredge · Structure no. F-15-AF

Built
1956
69 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
47 ft
1 main span
Daily traffic
3,300
2020 count
Owner
State
State Highway Agency

About this bridge

SH 74 Ml over Kerr Gulch is a steel stringer/multi-beam or girder carrying SH 74 Ml over Kerr Gulch in Jefferson County, Colorado. It was built in 1956, so it is 69 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 3,300 vehicles a day, roughly 2% of them trucks, projected to reach 3,399 by 2040. The structure is 47 ft (14.4 m) long and 40 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSH 74 Ml
CrossesKerr Gulch
Location0.8 MI E of Kittredge
RouteState Highway 74A
CountyJefferson County
StateColorado
Coordinates39.65954, -105.28669
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.6 US tons
Inventory rating23.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length47 ft (14.4 m)
Longest span44 ft (13.3 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,300 (2020)
Projected traffic3,399 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 74 Ml over Kerr Gulch built?

It was built in 1956, making it 69 years old in 2025.

What condition is SH 74 Ml over Kerr 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 August 2023.

How much traffic does SH 74 Ml over Kerr Gulch carry?

About 3,300 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is SH 74 Ml over Kerr Gulch?

The structure is 47 ft (14.4 m) long with a longest span of 44 ft (13.3 m) and a deck 40 ft wide.

Who owns SH 74 Ml over Kerr Gulch?

It is owned by the State Highway Agency.