1220 Dearborn Ave | Hwy 251 - South Beloit, IL 61080
(815) 389-1479  

Pearl Lake... check out business hours below.

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Beach :


2019 HOURS



Monday - Friday  9 to 5 Will Close for the season Friday Oct. 18th. Inquiries please call 815-389-1479

Saturday  CLOSED

Closed on Sunday

Camping: CLOSED for the 2019 season 

Diving: CLOSED for the season!

Restaurant: Pearl Lake Restaurant will not be serving dinners on Friday and Saturday nights this season.

We would like to thank everyone who has come to dinner over the past 55 years.  It has been a pleasure and greatly appreciated.

The beach, the snack bar for the beach, scuba diving, campground and the trailer sales will all be open at their normal times of business.



For over 50 years Pearl Lake has been a destination for recreational scuba diving and diver training in the Midwest.Its 35 acres of clear water offers prolific and diverse aquatic life, multiple easy-access dive entry points, a dozen diver training platforms and a number of interesting dive sites including a school bus, a twin-engine airplane, a vintage steam shovel and over 15 sunken vessels including a 33 ft. yellow submarine, 30 ft. patrol boat and a 45 ft Great Lakes fishing trawler. Located in South Beloit, IL at the Illinois / Wisconsin Stateline and just 5 minutes West of Interstate 90, Pearl Lake offers one of the finest diving and diver training environments in the country. At first glance, you would expect to find this crystalline lake nestled somewhere in the Northwoodâ. Instead, it is just a few minutes north of Rockford, Illinois, the state's third largest city and only a convenient one hour drive via interstate highways from the metropolitan areas of Chicago, Milwaukee and Madison.From April to October certified divers come here to enjoy a relaxing day of diving in an undemanding but interesting and enjoyable environment.  The lake offers an ideal site for certified divers to sharpen their skills after a time out of the water and to be able to share a dive outing with family in Pearl Lake's park like atmosphere.

Additionally, the finest professional dive stores and instructors in the Midwest utilize the lake to initiate their students to diving at this site ideally suited for their introduction to the exciting underwater world, or to offer advanced and specialty training programs spanning nearly every aspect of recreational scuba diving.

About Diving Pearl Lake

Article:  Pearl Lake Diving Gem of the Midwest - with Photos

Article:  Pearl Lake Diving Gem of the Midwest - Text Only


Diving Schedule

The diving season begins in late April with diving available seven days a week and ends in October (call or visit for opening and closing dates).  Diving hours are from 8:00am until dusk with check-out required before dark. Night diving is permitted on Fridays and Saturdays and divers must be checked out and off the grounds before 10:00 pm (please notify the staff when you register that you intend to night dive).

Diving Fees

  • $20.00 Divers -  (Complimentary beach entry included when open)
  • $15.00 Non-Divers -  (Complimentary beach entry included when open)
  • Airfills - $10.00/Tank

(Check at registration for hours of availability or call ahead to confirm - 815-389-1479)

Equipment rental is NOT available at the lake ... please check with your local dive store.

Diving Area Rules and Regulations


  • When arriving for the diving day, follow the signs to the registration area.
  • Certified divers must provide a nationally recognized certification card, personally sign a liability release/waiver, agree to follow standard safe diving practices and must register and dive with another certified diver.
  • Student divers must register in the company of a certified instructor, asst. instructor or divemaster (as appropriate to the training being conducted) and must sign the same liability release/waiver.
  • Any non-divers (over the age of 10) accompanying certified or student divers into the diving area are required to register, sign a liability release/waiver and pay the daily non-diver fee. Any non-diving children must be under the supervision of an adult at all times!
  • EVERYONE entering the diving area, for any period of time, is required to pay the diver or non-diver fee … there are NO EXCEPTIONS. Pearl Lake is not a “public park” and each individual on the grounds must be a paid patron … diver, non-diver, beach customer or camper.
  • IMPORTANT NOTE ... A vehicle is necessary to reach the diving area. This means that non-diving parents or guardians accompanying younger divers will be required to pay the non-diver fee in order to transport them to the diving area.
  • EACH diver and non-diver is issued a pass that must be placed on their vehicle’s dashboard while in the diving area (one pass per each individual is required). Please read it. The card lists the general diving rules and information, as well as procedures to be followed in an emergency. ALL cards should be returned and each individual should sign out at the registration area upon completion of the diving day.
  • All divers must use equipment appropriate to the diving environment including a buoyancy device, regulator system with an alternate air source and instrumentation and an environmental suit applicable to the current diving conditions.
  • Divers involved in "specialty" diving activities such as night diving, should have appropriate training and be equipped in accordance with accepted safe diving guidelines as related to that activity.
  • SWIMMING, SNORKELING OR WADING IS NOT ALLOWED IN THE DIVING AREA. Divers must be fully equipped to be in the water and non-divers must stay completely out of the water in the diving area (swimming and wading are allowed only at the swimming beach, … both registered divers and non-divers can gain complimentary entry to the beach, when open, at the diving registration area).

Emergency Procedures

The following emergency procedures are detailed on both the Diver and Non-Diver Passes:

Indicate that you are “in the Pearl Lake Diving Area” and the dive site where you are located. Relate the type of emergency that you have … i.e. diving or general injury/health concern, lost diver, etc.

Then contact a security person on the grounds or call the Pearl Lake registration area at 815-389-1479 to report the emergency and that 911 has been contacted.

Per the recommendations of the DIVERS ALERT NETWORK, if you suspect a diver has a dive-related injury and needs evaluation, you should safely:

  • Monitor airway, breathing, circulation
  • Provide 100 percent oxygen if you are a trained oxygen provider.
  • Call the local EMS for transport or assist in the transport of the injured diver to medical care.
  • Call the DAN Emergency Hotline at +1-919-684-9111 (emergencies can call collect) for consultation and advice.

Click here for DAN's recommendations relative to recompression chamber location and contact procedures.

Seasonal Lake Conditions and Maps

Pearl Lake’s diving season begins in late April and ends in mid-October each year (call 815-389-1479 for opening and closing dates). Early season visibility can be quite good; in some years approaching as much as 40 ft or more. Of course cold water temperatures are to be expected (+/- 50° F) with no thermocline present at that time. Consequently a dry suit or heavy wetsuit is necessary, as are a hood, boots and gloves. Temperatures gradually rise through May and June. Typically by mid-June a thermocline has formed between 15-20 ft. and temperatures above it allow for a lighter-weight wet suit, with a hood and gloves usually optional above the thermocline. Venturing below it for any period of time then or through the balance of the season usually requires most divers to return to using a hood and gloves. “Braver souls” may forego or use light-weight gloves for short excursions deeper, but most divers will still be most comfortable wearing a hood. Usually by July, the shallow water temperatures are in the high-70’s/ low-80’s and the thermocline is approaching 25 ft. Very late September and early October temperatures can require a return to the necessity of dry suits and heavier wet suits along with a hood, boots and gloves. The thermocline is usually approaching a depth of 40 ft. or deeper by this time. Because of entries over sand and gravel, boots are recommended at all times.

As mentioned, visibility can be excellent early in the season. Typically it will begin to drop off as the water warms. By mid-June, one can expect 15-20 ft. above the thermocline with it decreasing below it. By mid-August, the visibility begins to increase again and into September and October it is typically 30 ft., and may reach 40 ft. or more. The visibility is typically very good down to the thermocline at this time and sometimes below it as well.


Map to Pearl Lake


Dive Site Map - B & W

Dive Store / Dive Professional Information

Check with the Pearl Lake management regarding special considerations relating to entry and airfill fees.

NOTE: All certified diving professionals conducting training or supervising diving activities at Pearl Lake must complete Pearl Lake's Diving Professional Use Agreement, strictly adhere to the policies and procedures required of them by their certification agency and provide to Pearl Lake a copy of their certificate of current diving liability insurance with Pearl Lake listed as an "additional insured".


Coming Soon .... !