US Bridges

Herman RD over Ironstone Canal

Fair

Montrose County, Colorado · .5 MI W of S River RD · Structure no. 085024A00.5063A

Built
1989
36 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
27
2022 count
Owner
County
County Highway Agency

About this bridge

Herman RD over Ironstone Canal is a steel stringer/multi-beam or girder carrying Herman RD over Ironstone Canal in Montrose County, Colorado. It was built in 1989, so it is 36 years old, younger 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 6 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 27 vehicles a day, projected to reach 32 by 2042. The structure is 31 ft (9.3 m) long and 24 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesHerman RD
CrossesIronstone Canal
Location.5 MI W of S River RD
RouteCounty Highway 0
CountyMontrose County
StateColorado
Coordinates38.5798, -107.98984
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating35.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length31 ft (9.3 m)
Longest span29 ft (8.7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27 (2022)
Projected traffic32 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 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 Herman RD over Ironstone Canal built?

It was built in 1989, making it 36 years old in 2025.

What condition is Herman RD over Ironstone Canal 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 October 2023.

How much traffic does Herman RD over Ironstone Canal carry?

About 27 vehicles per day (2022 count).

How long is Herman RD over Ironstone Canal?

The structure is 31 ft (9.3 m) long with a longest span of 29 ft (8.7 m) and a deck 24 ft wide.

Who owns Herman RD over Ironstone Canal?

It is owned by the County Highway Agency.