Boulder Reservoir

Boulder Reservoir

Boulder, Boulder County, CO
1mi²
ft
Directions
Lake Information

Boulder Reservoir is a man-made lake located in Boulder County, Colorado. With a surface area of 586 acres, the reservoir is a popular destination for outdoor enthusiasts looking to engage in water-based activities such as swimming, fishing, and boating. The lake is also surrounded by beautiful natural landscapes, including the Rocky Mountains, which provide visitors with plenty of opportunities to explore the great outdoors. The reservoir was created in 1955 when the Boulder Dam and Reservoir Company constructed a dam on the Boulder Creek. The primary purpose of the dam was to provide a reliable water source for the surrounding area, including the city of Boulder. Today, the reservoir also serves as a popular recreational area, attracting visitors from all over the region. Fishing is a popular activity at Boulder Reservoir, with anglers seeking out species such as channel catfish, largemouth bass, bluegill, and rainbow trout. The reservoir is stocked regularly with fish, and fishing licenses can be purchased on-site or online. Boating is another popular activity at the reservoir, with visitors able to launch boats from the on-site boat ramp. However, due to safety concerns, motorized boats are only allowed on the reservoir during specific hours. Boulder Reservoir is also home to a swimming beach that is open during the summer months. The beach is staffed with lifeguards, and there are facilities on-site for changing and showering. In addition to swimming, visitors can also engage in other water-based activities such as kayaking, stand-up paddleboarding, and windsurfing. The surrounding area of the reservoir is home to several hiking and biking trails, providing visitors with plenty of opportunities to explore the beautiful natural landscapes of Colorado. There are also several picnic areas located around the reservoir, making it an ideal spot for a day out with family or friends. Overall, Boulder Reservoir is a great destination for anyone looking to enjoy the beauty of the Colorado outdoors while engaging in a variety of recreational activities.

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Current Conditions

45°F°
Feels like 45°F°
Drizzle
Today's High
57°F°
Today's Low
43°F°

Water Temperature

62°F
Updated: (May 6)
Sign in to contribute temps.

Current water temperature for Boulder Reservoir is 62°F.

Current Snapshot

Wind2 mph WNW (Gust 6 mph)
Pressure
30.11 inHg
Visibility7 mi
Humidity86%
Cloud Cover99%

Forecast: Wednesday, May 7

Day 1 of 9

Hourly Insights

7 AM
45°F°
27%
10 AM
46°F°
22%
1 PM
52°F°
40%
4 PM
52°F°
33%

Temperature

High
57°F°
Low
43°F°

Precipitation

Chance80%
Amount0.44"
Typerain

Wind

4mph
Avg Speed
Gusts up to
19mph
CalmModerateStrong
Max Speed11 mph

Sun, Moon & UV

Sunrise11:53 AM
Sunset2:02 AM
Moon PhasewaxingGibbous
Max UV Index4 (Moderate)

Solunar Fishing Forecast

Action Rating
2/5

Todays action is rated a 2 (scale is 0 thru 5, 5 is the best)

Major Times (Best)

3:19 AM - 5:49 AM

12:54 PM - 3:24 PM

Minor Times (Good)

9:03 PM - 10:33 PM

9:06 AM - 10:36 AM

Outlook for Wednesday at Boulder Reservoir

Expect temperatures ranging from 43°F to 57°F. There's a 80% chance of rain, potentially bringing around 0.44" rain. Winds will be averaging 4 mph, with potential gusts reaching up to 19 mph. The maximum UV index will be 4 (Moderate), so plan sun protection accordingly. For anglers, today's fishing action is rated 2/5 (Todays action is rated a 2 (scale is 0 thru 5, 5 is the best)). Look for the best bite times during the major periods around 3:19 AM and 12:54 PM, or try the minor windows near 9:03 PM and 9:06 AM for potential early morning or evening action. Check back for the latest conditions and forecasts for Boulder Reservoir.

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May 7th 2025

Lake Information

Elevation
N/A
Area
1 mi²
Coordinates
40.072, -105.221

Weather Forecast

Wednesday

57°F
43°F

Thursday

64°F
39°F

Friday

69°F
45°F

Saturday

73°F
47°F

Sunday

75°F
48°F

Monday

78°F
50°F

Tuesday

77°F
50°F

Wednesday

60°F
47°F

Thursday

67°F
41°F
Wednesday - 5/7/2025
57°F
43°F
12am
44°F
62°F
30.15 hPa
2 mph
NNE
G: 5 mph
2am
44°F
62°F
30.13 hPa
1 mph
NNW
G: 9 mph
4am
44°F
62°F
30.13 hPa
5 mph
NNW
G: 12 mph
6am
44°F
62°F
30.15 hPa
5 mph
NNW
G: 11 mph
8am
46°F
62°F
30.17 hPa
3 mph
N
G: 9 mph
10am
46°F
62°F
30.18 hPa
3 mph
WSW
G: 8 mph
12pm
50°F
62°F
30.17 hPa
5 mph
ESE
G: 11 mph
2pm
54°F
62°F
30.13 hPa
8 mph
NNE
G: 14 mph
4pm
52°F
62°F
30.11 hPa
10 mph
SE
G: 16 mph
6pm
56°F
62°F
30.10 hPa
3 mph
ENE
G: 7 mph
8pm
49°F
62°F
30.12 hPa
4 mph
W
G: 6 mph
10pm
45°F
62°F
30.16 hPa
3 mph
WSW
G: 4 mph

Water Temperature History

Trends for Boulder Reservoir

Current Temp

Sign in to view

Latest recorded surface temperature.

Lowest in Period

33°F

On Jan 12

Coldest point in the Last 12 Months.

Average in Period

53°F

Typical temp during the Last 12 Months.

Temperature Trend: Last 12 Months

Surface temperature over the selected period.

Key Observations (Last 12 Months)

  • Warmest avg: July (80°F).
  • Coolest avg: February (33°F).
  • Rapid warming often occurs: March → April (+18°F).
  • Sharpest cooling trend: September → October (-18°F).

Weather Forecast

Wind speed and pressure trends

Hourly Wind Forecast

Wind Direction

14°

Pressure

1021 mb

Cloud Cover

100%

Visibility

7 miles

Daily Pressure Forecast

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Frequently Asked Questions About Boulder Reservoir

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