Important Notice to Mariners
Lake Mead water elevations will be declining throughout the summer. Before launching, check lake levels, launch ramp conditions, changes to Aids to Navigation and weather conditions by clicking on More »
Areas of Park Impacted by Storm Damage
Strong storms rolled through Lake Mead National Recreation Area Aug. 3-4, causing damage to some areas of the park. Crews are working to restore the below locations. Debris may be present in other areas of the park, as well, especially in the backcountry. More »
Goldstrike Canyon, Arizona Hot Spring Trails Temporarily Closed
A temporary emergency closure is in place for Goldstrike Canyon and Arizona Hot Spring trails within Lake Mead National Recreation Area, beginning Aug. 1. This closure includes National Park Service and Bureau of Reclamation lands. More »
Summer Fire Rules in Effect
Lake Mead NRA is now enforcing summer fire restrictions. Please click 'more' to learn about the rules for fire during our hot, dry season. More »
Popular Dive Locations
Kingman Wash: gentle slope, good for novice divers, occasional heavy boat traffic, visibility variable. Access by boat. Location (JPEG)
Black Canyon in Boulder Basin: sheer wall diving, usually good visibility. Access by boat. Location (JPEG)
Scuba Beach (North Boulder Beach): Location (JPEG)
Gypsum Reefs-Virgin Basin: extensive white gypsum reef area with irregular underwater erosion forms, visibility variable. Note: eroded formations may present unstable overhangs. Access by boat. Location (JPEG)
Cathedral Cove: about 5 miles south of Echo Bay, protected water, usually good visibility, interesting underwater formations. Access by boat. Location (JPEG)
Black Canyon: moderate to swift water, usually good visibility, water temperature 52-55 degrees F all year, steady boat traffic, excellent current drift diving conditions. For experienced divers. Access by boat. Location (JPEG)
Ringbolt Rapids: advanced divers only, swift and turbulent water for about 100 yards, visibility usually only fair due to turbulence and bubbles, 50-70 foot depression at base of rapids. NOTE: Hand-held buddy line and surface support boat are essential. Boulders and rock formations may pose a hazard along canyon walls. Access by boat. The high water flows and boulders along with other obstructions make Ringbolt Rapid a potentially hazardous dive along the Nevada side. AVOID THE NEVADA SIDE. Location (JPEG)
Work Barge: located 4¼ miles below Hoover Dam on the Arizona side. The 38 foot tow barge was used on the spillway tunnel repair project and sank in 1946. It is located in about 25-35 feet of water in moderate to swift current. The barge is protected under the Antiquities Act, therefore, nothing may be removed or damaged. Access by boat. Location (JPEG)
Cabinsite Point (North of Katherine Landing): vessels prohibited. Two boat wrecks. Access by vehicle. Location (JPEG)
Lake Mead - the following are areas closed to diving:
1. Above and below Hoover dam. Location (JPEG)
2. The portion of the Lower Overton Arm of Lake Mead, from a northern boundary at approximately Latitude N. 36° 15' to a southern boundary at approximately Latitude N. 36° 10', and from the western shoreline to the eastern shoreline, is closed to all forms of underwater diving. The restriction is necessary to protect a sensitive archaeological resource, the submerged B-29 aircraft, while the National Park Service completes a resource protection plan for the area. The B-29, and the site upon which it rests, are managed by the National Park Service under the National Historic Preservation Act. Location (JPEG)
3. All designated boat harbors. Divers employed by concessioners diving on official business and special events approved by the National Park Service are exempt from this restriction.
4. Water intake tunnel and the water intake overhead boom, located on the east side of Saddle Island, just north of Boulder Harbor. Location (JPEG)
Lake Mohave - the following areas are closed to diving:
1. Above and below Davis Dam. Location (JPEG)
2. All designated boat harbors. Divers employed by concessioners diving on official business and special events approved by the National Park Service are exempt from this restriction.
Potentially Hazardous Areas
1. North of South Cove: Shallow river channel, soft, viscous silt layers on bottom several feet thick. The further uplake you travel, the muddier the water becomes due to the silt content of the Colorado River. Also, the thermocline is usually found at a depth of 5-10 feet with the water temperature dropping to the low 50 degrees. There are hazardous rapids that form and shift depending on water levels. Location (JPEG)
2. Ski Beach and Personal Watercraft Beach near Hemenway Harbor: excessive boat traffic, especially from Easter to Thanksgiving. Location (JPEG)
3. Gypsum ledges, which have been eroded by wind and water, may have unstable overhangs. Location (JPEG)
Lake Mohave (up to 17 feet annual vertical fluctuation)
1. From Hoover Dam to Chalk Cliffs (22 miles): narrow channel and heavy boat traffic.
2. Ringbolt Rapids (8 miles north of Willow Beach): swift and turbulent water up to 16 miles per hour, depth to 70 feet. Recommended for ADVANCED DIVERS ONLY. Location (JPEG)
3. Katherine Landing area: heavy boat traffic. Location (JPEG)
General Diving Conditions
Visibility also varies with depth: the deeper one goes, the darker it gets. This is particularly pronounced in the summer months when the thermocline formed by warmer surface waters is present. During the summer months the first distinct thermocline usually occurs near the 30 foot to 40 foot depth. From surface level to 30 feet in depth, the temperature may range from 70° to 82° Fahrenheit, and this layer supports the majority of algae growth. The second distinct thermocline usually is found near the 60 foot depth. Between 30 feet and 60 feet the temperature ranges from 70° to 60° F with less algae present due to cooler water. Below 60' in depth, the water temperature is 60° to 52° F. At this depth, the water is usually clear but much darker in summer than in winter due to the dissipation of the light caused by the presence of algae in the warmer water above. During the winter, there is usually no thermocline with the entire water column is in the low 50 degrees.
There are several exceptions. Where rivers or streams flow into Lake Mead, visibility is poor year round due to high silt content or excessive algae growth. Examples are: Overton Arm where the Virgin and Muddy Rivers flow into Lake Mead; and Las Vegas Bay near the terminus of Las Vegas Wash. The reverse is true, however, from Hoover Dam to mid-way between Willow Beach and Eldorado Canyon. The colder water released from Hoover Dam (52-55 degrees F) provides clear water and good visibility throughout the year.
Most of the currents in Lake Mead and Lake Mohave are slow and undetectable. From Hoover Dam to mid-way between Willow Beach and Eldorado Canyon, however, the current ranges from 3 to 12 miles per hour. This current is variable depending on the volume of water released from Hoover Dam and the water level in Lake Mohave. At Ringbolt Rapids, the speed of the water may reach 16 miles per hour.
Navigational and cove name maps are available at Lake Mead Visitor Center and all marinas.
There are dive shops in Boulder City, Henderson, Las Vegas, Nevada, and Bullhead City, Arizona, which supply equipment sales and rental, instruction and air. Check the local telephone directory.
Nevada and Arizona State fish and game regulations are in effect. A combination Nevada/Arizona fishing license is required. Spearfishing is legal for carp and striped bass ONLY. Spearfishing for striped bass is permitted throughout Lake Mead but only from the cable below Hoover Dam to Cottonwood Cove on Lake Mohave. Spearfishing is prohibited within 1/2 mile of any dock or shoreline activity area.
Fish - the following species of fish may be found in the two lakes:
Largemouth Black Bass: During the spring and summer they can be observed guarding their egg nests or schools of fry. During this period their behavior is aggressive. (No spearfishing)
Other Aquatic Life
Crayfish: They are found in heavy bottom vegetation, rarely seen.
2. Never dive alone. Use the "buddy" system.
3. Fly the standard red and white diving flag within 100 feet of diver while diving. A floating tow flag is essential in many areas due to heavy boat traffic.
4. Plan your dive; dive your plan.
5. Do not dive beyond the capability of the least experienced member of your group, and do not dive unless trained and certified.
6. Check the latest weather forecasts. (NOAA Weather Page) All launch ramps have weather boards.
REMEMBER: Whenever a diving accident victim goes to a chamber for treatment the following information is necessary:
1. Victim's full name and age.
2. Victim's symptoms and treatment administered after discovery.
3. Profile of dives, depths and bottom times during past 12 hours before accident.
4. Depth and bottom time of last dive (or during dive) before accident.
5. Brief description of accident and names of witnesses.
6. Flight number or airline, estimated time of arrival and airport. Include airplane's pressurized altitude if possible. (If using the back-up chambers in California)
Lake Mead and the lower Colorado River system contain harmful quagga mussels. Do your part and help prevent the spread of Aquatic Invasive Species (AIS).
CLEAN Remove all mud, plants and animals from every part of your boat, trailer and equipment.
DRAIN Before you leave the recreation area,eliminate all water from your boat, including its live-wells, ballast, hull and engine-cooling water.
DRY Allow time for your boat to completely dry before you launch in any other waters.
Did You Know?
Hoover Dam was the first major dam to span the wild Colorado River. One hundred twelve workers died before it was finished in 1935.