Three Oaks Recreation Area
Welcome to Three Oaks Recreation Area, a 300-acre quarry located in Crystal Lake, McHenry County, Illinois, United States. As a certified diver, you can now explore our pristine scuba area, conveniently accessible from the East Marina or via shore.
Within the designated diving area, spanning approximately 3 acres, you will find three training platforms. These platforms are positioned 100 feet apart at a depth of 25 feet, clearly marked with buoys at the surface. The maximum depth in our dive site reaches 45 feet, allowing for thrilling underwater adventures.
Depending on the time of year, visibility ranges from 10 to 40 feet, ensuring a captivating and immersive diving experience. As you navigate the waters, you can encounter a variety of fresh water fish species, including Bass, Blue Gill, Crappie, Catfish, Northern Pike, and more.
At Three Oaks Recreation Area, safety is our top priority. To access the diving area, please check in at the Marina and present a valid certification card and photo ID. Remember to always dive with a buddy, tow a surface float or flag, and comply with the operating hours from 8 am to 7 pm. The minimum age for diving is 12 years old, and divers within the age range of 12-17 must be accompanied by a certified dive instructor or a certified parent/guardian throughout the entire dive. To ensure security, we will hold your driver's license and car keys until checkout.
As for fees, residents enjoy free parking, while non-residents can park for a nominal fee of $5.00. Diving rates for residents are $15.00 and $20.00 for non-residents. Please note that during the months of October and November, Monday through Thursday, reservations are required. You can reach us at 815-790-8840. On Fridays through Sundays, our dive site operates from 7 am until sunset.
Attention diving professionals! If you're seeking a location for training purposes, Three Oaks Recreation Area welcomes you. For training inquiries, please contact the City of Crystal Lake at 815-459-2020.
Embark on an unforgettable underwater journey at Three Oaks Recreation Area and discover the wonders beneath the surface.
Within the designated diving area, spanning approximately 3 acres, you will find three training platforms. These platforms are positioned 100 feet apart at a depth of 25 feet, clearly marked with buoys at the surface. The maximum depth in our dive site reaches 45 feet, allowing for thrilling underwater adventures.
Depending on the time of year, visibility ranges from 10 to 40 feet, ensuring a captivating and immersive diving experience. As you navigate the waters, you can encounter a variety of fresh water fish species, including Bass, Blue Gill, Crappie, Catfish, Northern Pike, and more.
At Three Oaks Recreation Area, safety is our top priority. To access the diving area, please check in at the Marina and present a valid certification card and photo ID. Remember to always dive with a buddy, tow a surface float or flag, and comply with the operating hours from 8 am to 7 pm. The minimum age for diving is 12 years old, and divers within the age range of 12-17 must be accompanied by a certified dive instructor or a certified parent/guardian throughout the entire dive. To ensure security, we will hold your driver's license and car keys until checkout.
As for fees, residents enjoy free parking, while non-residents can park for a nominal fee of $5.00. Diving rates for residents are $15.00 and $20.00 for non-residents. Please note that during the months of October and November, Monday through Thursday, reservations are required. You can reach us at 815-790-8840. On Fridays through Sundays, our dive site operates from 7 am until sunset.
Attention diving professionals! If you're seeking a location for training purposes, Three Oaks Recreation Area welcomes you. For training inquiries, please contact the City of Crystal Lake at 815-459-2020.
Embark on an unforgettable underwater journey at Three Oaks Recreation Area and discover the wonders beneath the surface.
Diving Conditions Score for Three Oaks Recreation Area
5.5
AverageAverage conditions, be alert.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Three Oaks Recreation Area
Depth
12m
Visibility
4m
Experience Level
beginner
advanced
Weather Conditions for Three Oaks Recreation Area
Wave Height
1m
Wind Speed
21.5 m/s
Water Temp
18°C
Visibility
30.5km
Cloud Cover
0%
Wave Period
8s
Air Temperature
18.1°C
Precipitation
0 mm
Detailed 7-Day Diving Forecast for Three Oaks Recreation Area
Alpha
Dive Score Chart for Three Oaks Recreation Area
Best time to dive: 9:00 with score 7.555133333333333/10. Water conditions: Waves 1m, Wind 2.3 m/s.Best night dive time: 2:00 with score 7.063333333333333/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Three Oaks Recreation Area: 06:00
Sunset at Three Oaks Recreation Area: 18:00
Optimal diving conditions at Three Oaks Recreation Area are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.
Best Overall
9:00Score: 7.6/10
Waves: 1m (8s), Wind: 2.3 m/s
Best Night
2:00Score: 7.1/10
Waves: 1m, Wind: 3.1 m/s
Seasonal Analysis for Three Oaks Recreation AreaAlpha
Historical patterns and best seasons for diving at Three Oaks Recreation Area
The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.
Monthly Dive Score Analysis - Seasonal Diving Conditions
Higher values indicate better diving conditions
Seasonal DiveScore Chart
This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.
Higher values indicate better diving conditions
Best Season for Three Oaks Recreation Area
Winter
Avg. Score: 8.2/10
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Three Oaks Recreation Area
January
Score: 8.6
December
Score: 8.1
February
Score: 8.0
Ideal Conditions for Three Oaks Recreation Area
Water Temp
23.0°C / 73.4°F
July
Visibility
14.7m / 48.2ft
January
Wave Height
1.1m / 3.6ft
January
Wave Period
8.0s
January
Seasonal Insights for Three Oaks Recreation Area
Three Oaks Recreation Area shows typical northern hemisphere patterns with July being the warmest month (23.0°C) and January the coldest (-12.3°C). The calmest conditions typically occur in January with average wave heights of 1.1m and wave periods of 8.0s. The most comfortable wave conditions are in January with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). January is usually the driest month with 0.0mm of precipitation. For beginners, the best time to visit would be during January to March, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.
Last updated: 1 min. ago - Jun 21, 2026
Note: This dive site is not a verified dive site. Please dive with caution. This dive site might have incorrect information by the community.
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