US Bridges

SH 9 Ml over Blue River

Good

Summit County, Colorado · 11.5 MI No of JCT I70 · Structure no. E-12-I

Built
2002
23 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
135 ft
1 main span
Daily traffic
2,800
2020 count
Owner
State
State Highway Agency

About this bridge

SH 9 Ml over Blue River is a prestressed concrete stringer/multi-beam or girder carrying SH 9 Ml over Blue River in Summit County, Colorado. It was built in 2002, so it is 23 years old, younger 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 2,800 vehicles a day, roughly 12% of them trucks, projected to reach 3,220 by 2040. The structure is 135 ft (41 m) long and 42 ft wide. If it were closed, the detour would be 60.9 mi (98 km).

CarriesSH 9 Ml
CrossesBlue River
Location11.5 MI No of JCT I70
RouteState Highway 9D
Coordinates39.75927, -106.13688
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
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 rating38.9 US tons
Inventory rating36.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length135 ft (41 m)
Longest span132 ft (40.1 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2020)
Projected traffic3,220 by 2040
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.9 mi (98 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$534,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 9 Ml over Blue River built?

It was built in 2002, making it 23 years old in 2025.

What condition is SH 9 Ml over Blue River 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 August 2023.

How much traffic does SH 9 Ml over Blue River carry?

About 2,800 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is SH 9 Ml over Blue River?

The structure is 135 ft (41 m) long with a longest span of 132 ft (40.1 m) and a deck 42 ft wide.

Who owns SH 9 Ml over Blue River?

It is owned by the State Highway Agency.