US Bridges

SH 7 Ml over Draw

Fair

Boulder County, Colorado · 0.35 MI E of 75th ST · Structure no. D-16-BW

Built
1928
97 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
35 ft
2 main spans
Daily traffic
19,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 7 Ml over Draw is a concrete culvert carrying SH 7 Ml over Draw in Boulder County, Colorado. It was built in 1928, so it is 97 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 19,000 vehicles a day, roughly 2% of them trucks, projected to reach 24,130 by 2040. The structure is 35 ft (10.6 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSH 7 Ml
CrossesDraw
Location0.35 MI E of 75th ST
RouteState Highway 7C
Coordinates40.01468, -105.17147
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length35 ft (10.6 m)
Longest span17 ft (5.1 m)
Deck width31 ft (9.5 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,000 (2020)
Projected traffic24,130 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$183,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 7 Ml over Draw built?

It was built in 1928, making it 97 years old in 2025.

What condition is SH 7 Ml over Draw 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 July 2023.

How much traffic does SH 7 Ml over Draw carry?

About 19,000 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is SH 7 Ml over Draw?

The structure is 35 ft (10.6 m) long with a longest span of 17 ft (5.1 m) and a deck 31 ft wide.

Who owns SH 7 Ml over Draw?

It is owned by the State Highway Agency.