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Millbrook Quarry (aka Lake Millbrook)
 Lat/Long: 38.8234,-77.704, Haymarket, VA 20143
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Max Depth: 91-100ft/28-30m
Average Viz: 11-15ft/3-5m
Entry Type: Shore
Bottom Composition: Clay/Muck
Aquatic Life: Might See Something
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Rating: 2.91 by 45 divers
Spring: Under 50°F/10°C
Summer: 66-70°F/19-21°C
Fall: 56-60°F/13-16°C
Winter: Under 50°F/10°C
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Millbrook Quarry (aka Lake Millbrook) is a shore accessible fresh water dive site, located at Lat/Long: 38.8234,-77.704, Haymarket, VA 20143. This dive site has an average rating of 2.91 out of 5 from 45 scuba divers. The maximum depth is 91-100ft/28-30m. The average visibility is 11-15ft/3-5m. Training platforms are available.
As of March 2020 Millbrook Quarry is closed and no longer leased by Coral Edge Adventures. Lake Phoenix is in discussion with property owner to reopen but nothing has been formalized.
Millbrook Quarry is located about 5 miles off of exit 40 on I-66 in Haymarket, Virginia. It is about ten minutes from Manassas, and about 30 minutes from Washington, DC .
Lake Millbrook currently has three entrance areas or "beaches". The near-surface platform at Beach 1 has been removed and replaced by crushed rock laid out from the beach entrance and graduated/sloped into the water for several feet.
The "beaches" have been renamed as follows:
Beach 1 is Sunset Beach.
Beach 2 1/2 is Adventure Wall.
Beach 3 is Omaha Beach. NOTE: Omaha Beach will not be useable until July 2017.
There are multiple underwater training platforms situated at 30’, and are connected to large surface buoys that are clearly visible and accessible. Numerous objects have been submerged and serve as attractions to enjoy and explore. For example, you’ll find an airplane at 70’, a Winnebago at 80’, and several sunken boats and cars. The granite walls surrounding parts of the quarry provide spectacular underwater drop offs and visually stunning rock formations.
Amenities include a couple of Porta-Johns onsite, and a changing shed.
Bass, bluegill, and catfish make up the fish population, and they can be seen when the visibility allows. Crayfish have also been observed near the "swamp" area (south end of the quarry). Several years ago, the State of Virginia killed off the invasive zebra mussel population. Up until recently, the visibility has been poor, but it is improving. It ranges between 5’ to 25’ from the surface to about 30’, depending on weather and season of the year. As you descend past 30’, viz often increases while temps drop dramatically due to a thermocline, ranging in the low to mid-forties year round. During the summer months, the first 20 or 30 feet from the surface warm up to about 65 °F.