US Bridges

SH 348 Ml over Ironstone Canal

Good

Montrose County, Colorado · 2.7 MI W of Olathe · Structure no. J-04-BB

Built
1982
43 years old
Condition
Good
inspected March 2022
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
940
2020 count
Owner
State
State Highway Agency

About this bridge

SH 348 Ml over Ironstone Canal is a concrete culvert carrying SH 348 Ml over Ironstone Canal in Montrose County, Colorado. It was built in 1982, so it is 43 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 940 vehicles a day, roughly 5% of them trucks, projected to reach 1,109 by 2040. The structure is 21 ft (6.4 m) long and 48 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSH 348 Ml
CrossesIronstone Canal
Location2.7 MI W of Olathe
RouteState Highway 348A
Coordinates38.60624, -108.04227
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2022
Inspection intervalevery 48 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40.1 US tons
Inventory rating24 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (2.9 m)
Deck width48 ft (14.6 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic940 (2020)
Projected traffic1,109 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 348 Ml over Ironstone Canal built?

It was built in 1982, making it 43 years old in 2025.

What condition is SH 348 Ml over Ironstone Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2022.

How much traffic does SH 348 Ml over Ironstone Canal carry?

About 940 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is SH 348 Ml over Ironstone Canal?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (2.9 m) and a deck 48 ft wide.

Who owns SH 348 Ml over Ironstone Canal?

It is owned by the State Highway Agency.