US Bridges

County Road 27 over Illinois River

PoorPosted for load

Jackson County, Colorado · 0.6 MI N of ST HWY 125 · Structure no. 57002700.50024

Built
1980
45 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
26 ft
1 main span
Daily traffic
108
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 27 over Illinois River is a steel stringer/multi-beam or girder carrying County Road 27 over Illinois River in Jackson County, Colorado. It was built in 1980, so it is 45 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 108 vehicles a day, roughly 16% of them trucks, projected to reach 140 by 2043. The structure is 26 ft (8 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesCounty Road 27
CrossesIllinois River
Location0.6 MI N of ST HWY 125
RouteCounty Highway 0
Coordinates40.46275, -106.17672
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating18.7 US tons
Inventory rating11.2 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length26 ft (8 m)
Longest span25 ft (7.6 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic108 (2023)
Projected traffic140 by 2043
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 County Road 27 over Illinois River built?

It was built in 1980, making it 45 years old in 2025.

What condition is County Road 27 over Illinois River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does County Road 27 over Illinois River carry?

About 108 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is County Road 27 over Illinois River?

The structure is 26 ft (8 m) long with a longest span of 25 ft (7.6 m) and a deck 24 ft wide.

Who owns County Road 27 over Illinois River?

It is owned by the County Highway Agency.