States that use Colorado River water need to agree on new rules for sharing it by 2026. If they don't, they will likely end ...

As part of a Northern Water-led maintenance project, about 80% of the normal surface area will be drained from Boulder Reservoir, popular with boaters and watercraft users.

BOULDER, Colo. — Starting Sept. 1 and lasting until March 2021, crews will drain Boulder Reservoir and limit access to perform required maintenance work that usually happens every five to 10 years.

The city of Boulder is not currently using the reservoir as a source of drinking water, but the Northern Colorado Water District is. That agency has been advised of the situation.

The Boulder Reservoir swim area is closed at least until noon Wednesday because of high levels of bacteria found in the water. Wildlife activity may be the reason for the elevated bacteria levels ...

Hundreds of participants gather at the Boulder Reservoir on Jan. 1, 2015, to brave the frigid waters in the 2015 Boulder Polar Plunge, all to benefit the Boulder County AIDS Project. In the 32nd ...

The reservoir, which has been privately owned since the ’80s, was anonymously donated to the nonprofit Aug. 29, Colorado Water Trust announced in a press release. According to Boulder County property ...

An athlete died Sunday after being taken from the Boulder Ironman 70.3 triathlon to the hospital during the race Saturday, Ironman officials said in an emailed statement.

Rowing clubs that use Boulder Reservoir successfully lobbied the city to reduce a rental rate hike for their early morning practice times, saying the initial increase was so high it threatened to d… ...

An event production company has opened registration for a fall marathon and a summer half marathon at the Boulder Reservoir to replace the twice-cancelled Boulder Marathon, but the permits for the ...

BOULDER, Colo. (CBS4)- The Boulder Reservoir swim area has been closed because of elevated levels of bacteria. The swim area, located at 5565 N. 51st Street, will remain closed until at least ...