US Bridges

SH 7 Ml Wbnd over Boulder Creek

Poor

Boulder County, Colorado · Arapahoe Ave in Boulder · Structure no. D-15-AQ

Built
1938
87 years old
Condition
Poor
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
103 ft
2 main spans
Daily traffic
15,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 7 Ml Wbnd over Boulder Creek is a steel stringer/multi-beam or girder carrying SH 7 Ml Wbnd over Boulder Creek in Boulder County, Colorado. It was built in 1938, so it is 87 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.

It carries about 15,000 vehicles a day, roughly 4% of them trucks, projected to reach 16,950 by 2040. The structure is 103 ft (31.3 m) long and 52 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesSH 7 Ml Wbnd
CrossesBoulder Creek
LocationArapahoe Ave in Boulder
RouteState Highway 7C
Coordinates40.01459, -105.24509
Functional classUrban Other Principal Arterial

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating38.3 US tons
Inventory rating22.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length103 ft (31.3 m)
Longest span49 ft (14.9 m)
Deck width52 ft (15.8 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,000 (2020)
Projected traffic16,950 by 2040
Trucks4%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost$3.4 million (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 7 Ml Wbnd over Boulder Creek built?

It was built in 1938, making it 87 years old in 2025.

What condition is SH 7 Ml Wbnd over Boulder Creek 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 July 2023.

How much traffic does SH 7 Ml Wbnd over Boulder Creek carry?

About 15,000 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is SH 7 Ml Wbnd over Boulder Creek?

The structure is 103 ft (31.3 m) long with a longest span of 49 ft (14.9 m) and a deck 52 ft wide.

Who owns SH 7 Ml Wbnd over Boulder Creek?

It is owned by the State Highway Agency.