Llyn Brenig, Wales, United Kingdom

Lake Locations:

United Kingdom - Wales - North Wales -

Also known as:  Lake Brenig, Llyn Brenig Reservoir

Llyn (Lake) Brenig is a sparkling 920-acre (3.7 square kilometer) reservoir located in North Wales, in the heart of the Denbigh moors. Nestled between the counties of Conwy and Denbighshire, the reservoir is used to manage the flow of the River Dee as part of the River Dee regulation system. In conjunction with Llyn Celyn and Llyn Tegid, the lakes maintain the water supply for the residents of Llangollen, Wrexham, Chester and Merseyside. With its scenic heather and tree-lined shores, Llyn Brenig is also a wonderful place to visit with opportunities for fly fishing, walking, mountain biking, bird watching, exploring unique archaeological sites, or just a family picnic.

Construction of Llyn Brenig was completed in 1976; by 1979, the lake had filled. The catchment of the reservoir is significantly over-reservoired, meaning that when the water level is drawn down, it can take several years for it to completely re-fill. Llyn Brenig is therefore only used during severe drought conditions when Llyn Celyn and Llyn Tegid will not be able to maintain the flow of the River Dee. During the building of the reservoir, over 50 sites of Mesolithic (early Stone Age) and Bronze Age artifacts were discovered. These artifacts can be viewed in the Brenig Visitor Center on the south side of the lake. Burial and ceremonial monuments can be visited by following several archaeological trails on the north west side of the reservoir.

Llyn Brenig offers 14 miles (23 kilometers) of shoreline and features several trails which circle the entire lake. The landscape surrounding the lake is relatively flat and ideal for walking and cycling. Challenging trails for the more adventurous hiker and biker are also available and stretch into the Clocaenog Forest and around nearby Llyn Alwen. Llyn Brenig is also a great place for bird spotting, and there are a number of bird hides around the lake. The wild heather on the slopes of Marial Gwyn in the North Cambrian Mountains is maintained to provide a natural habitat for birds and other wildlife. Much of the moorland surrounding the lake is open access land, and Clocaenog Forest can be freely explored on foot, mountain bike or horseback.

Stocked with 36,000 rainbow trout shortly after its filling, Llyn Brenig is known as one of the best fly fishing lakes in the United Kingdom. In 1990, the reservoir was chosen to be the site for the World Fly Fishing Championships and has continued to be a host for international competitions. The current record stands at 17 pounds, 5 ounces (7.9 kilograms) for a trout caught in 2006. Additional watersports on the crystal clear lake include sailing, canoeing, and swimming. Large motorboats are not allowed on the lake in order to preserve the pristine environment of the lake and the water quality. Public boat launches and picnic areas can be found around the shoreline. An island in the northern end of the lake is a popular spot with kayakers and anglers. Along with rainbow trout, anglers can cast their line for brown trout and tiger trout.

There are no vacation rentals or holiday cottages directly on Llyn Brenig, but several self-catering cottages and hotels can be found within 10 miles (16 kilometers) of the lake. Touring caravan and camping sites can be found in Snowdonia National Park, just west of the lake. Covering 526,720 acres, the Park is the second largest National Park in Wales. The mountains of Snowdonia are the focal point of the park with Mount Snowdon reaching 3,560 feet (1,085 meters), the highest point in Wales. Over 100 summits of varying heights and difficulties are a draw for climbers. For non-climbers who would like a view from the top, the Snowdon Mountain Railway is available. An engineering marvel, the rack and pinion railway takes visitors to within 66 feet of the summit. The Snowdon Mountain Railway is considered one of the greatest railway journeys of the world.

For those who enjoy exploring castles, the striking ruins of Denbigh Castle and Dolwyddelan Castle are just a short drive from Llyn Brenig. Other attractions include the charming villages of Hiraethog and Cerrigydrudion. The Hiraethog region features a beautiful area of rolling heather moors, dense forests and tranquil lakes. Cerrigydrudion is a historic village clustered around crossroads that lead to a number of villages and towns in Wales. Vacation rentals, holiday cottages, and real estate for sale and rent can be found in both villages.

Llyn Brenig is the perfect holiday destination for those seeking seclusion and untouched beauty. Moorland, farmland, mountain ranges, forests, lakes and rivers offer an exciting variety of places to explore, activities to try, and attractions to visit. In addition to fishing, water sports, and wildlife, visitors to the reservoir can make their way to the top of the highest mountain in Wales and enjoy an unsurpassed view of the region. A visit to Llyn Brenig is one you will not soon forget.

Things to do at Llyn Brenig

  • Vacation Rentals
  • Fishing
  • Boating
  • Sailing
  • Swimming
  • Canoeing
  • Kayaking
  • Camping
  • Picnicking
  • Hiking
  • Biking
  • Horseback Riding
  • Wildlife Viewing
  • Birding
  • National Park
  • Ruins

Fish species found at Llyn Brenig

  • Brown Trout
  • Rainbow Trout
  • Tiger Trout
  • Trout

Llyn Brenig Photo Gallery

    Llyn Brenig Statistics & Helpful Links

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    Lake Type: Artificial Reservoir, Dammed

    Water Level Control: Dwr Cymru Welsh Water

    Surface Area: 920 acres

    Shoreline Length: 14 miles

    Normal Elevation (Full Pond): 1,240 feet

    Water Volume: 486,428 acre-feet

    Completion Year: 1976

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    Trophic State | LakeLubbers

    Trophic State measures the level of algae and nutrients in a lake.

    An oligotrophic lake is very clear (blue in color) and does not support much plant or fish life. A hyper-oligotrophic lake is the clearest of all lakes, and is nearly devoid of plants and fish.

    A mesotrophic lake is slightly green and supports a moderate degree of plant and fish life. A lake's most desired trophic state is generally this mid-point - the mesotrophic state.

    A eutrophic lake is somewhat murky and supports a large amount of plant and fish life. A hypereutrophic lake is clouded with algae, plant life, and fish life. A eutrophic or hyper-eutrophic lake can be difficult to navigate by boat - and is often an unpleasant place to swim.

    The use of phosphorus-rich and nitrogen-rich fertilizer on lawns and golf courses surrounding a lake can cause it to become eutrophic or hypereutrophic.


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    Catchment or Drainage Area | LakeLubbers

    This is the surrounding area that drains into a lake, including land, rivers and their tributaries. This is also known as the lake's "catchment basin".

    Small lakes at the highest peaks of mountains have small drainage areas. The world's oceans have the largest drainage areas.


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    Lake-Area Population | LakeLubbers

    This is the estimated number of people who live in a house with a view of a lake, plus those who self-describe the lake as their home, for example: "I live at Smith Mountain Lake."


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    Water Residence Time | LakeLubbers

    This is the estimated time that it takes for an amount of water equal to the entire volume of a lake to flow out of - or evaporate from - the lake.

    Residence Time can be as short as a few days for fast-flowing small lakes, and can exceed 100 years for slow-flowing large lakes.


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    Completion Year | LakeLubbers

    This is the year that a reservoir was first filled to the reservoir's normal elevation - or the year that a natural lake was first dammed. A large reservoir can take more than a year to fill after its dam is first closed.

    The Grand Anicut in southern India is generally considered the world's oldest dam that still operates. Grand Anicut was constructed in the second century BC. It now impounds an irrigation network that includes roughly one million acres.

    You can find many of the the world's newest reservoirs on LakeLubbers. Many of the world's oldest reservoirs appear on the last page of that list.


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    Water Volume | LakeLubbers

    This is the estimated volume of water that a lake contains -- measured at the lake's normal elevation. By this measure, the world's largest freshwater lake is Siberia's Lake Baikal.

    You can find many of the the world's largest lakes (by water volume) on LakeLubbers.

    Water Volume can be measured in acre-feet, in cubic miles, or in cubic kilometers. One acre-foot is the amount of water needed to cover one acre (43,560 square feet) to a depth of one foot. One cubic mile equals 3,379,200 acre-feet. One cubic kilometer equals 810,713 acre-feet.

    1 acre-foot is equal to 325,851 US gallons. Siberia's Lake Baikal contains about 6,276,367,740,000,000 gallons of freshwater - nearly 1 million gallons for every living person on earth.

    The other - and more widely used - measure of a lake's size is the lake's surface acreage. By that measure, the world's largest freshwater lake is North America's Lake Superior.


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    Maximum Depth | LakeLubbers

    This is the estimated greatest depth of the water in a lake -- measured at the lake's normal elevation. The world's deepest lake is Siberia's Lake Baikal; that lake's maximum depth is estimated at 5,314 feet.

    You can find many of the the world's deepest lakes on LakeLubbers. If you select the last page of that list, you will find the (maximum depth of) the shallowest lakes in our database.


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    Average Depth | LakeLubbers

    This is the estimated average depth of the water in a lake -- measured at the lake's normal elevation. If the water volume and surface area of a lake are known, an estimate of the lake's average depth can be calculated:

    Water volume ÷ Surface Area = Average Depth

    Example: 1,000,000 acre-feet ÷ 20,000 acres = 50 feet average depth


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    Maximum Elevation | LakeLubbers

    This is a lake's highest water level, measured by the lake's surface distance above sea level, that can occur during flooding. A lake's highest possible maximum elevation is usually the top of the lake's dam or spillway.

    At lakes that include residential development, government regulations usually forbid the construction of homes below a lake's maximum elevation.


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    Minimum Elevation | LakeLubbers

    This is a lake's lowest water level, measured by the lake's surface distance above sea level, that can be reasonably expected to occur. Low lake levels can occur due to deliberate seasonal draw downs for irrigation or impending snow melt, reduced water inflows, drought and evaporation, residential or commercial water demands, and hydropower generation.

    Some lakes' minimum and maximum elevations are virtually the same. Lakes that generate hydropower may vary by several feet - according to power demand. Lakes whose primary purpose is to prevent flooding can seasonally vary by 100 feet or more.

    When some lakes reach their minimum elevation, their boat ramps may not be long enough to permit boat access - and boats docked on shallow parts of the lake may end up on dry ground. In those cases, kayakers and shore-based anglers may be among the few happy recreational users of the lake.


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    Normal Elevation | LakeLubbers

    This is a lake's normal water level, measured by the lake's surface distance above sea level. For a reservoir, this water level is also known as "full pond" or "full pool".

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    Shoreline Length | LakeLubbers

    This is the length of the exterior shoreline around a lake - measured at the lake's normal elevation. The shoreline length can be considerably shorter or longer when lake water levels are lower or higher than normal.

    A lake with many coves has a much longer shoreline than a lake of similar surface area that is nearly circular in shape.

    When known, the shoreline miles that we report in our statistics include only the lake's exterior shoreline, and exclude the shorelines of islands located within a lake's boundaries. In lakes with many islands, those islands' combined shorelines may exceed a lake's exterior shoreline.

    You can find many of the world's longest-shoreline lakes on Lakelubbers.


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    Surface Area | LakeLubbers

    This is the area (acreage, square kilometers, etc.) of the top surface area of a lake - measured at a lake's normal elevation. The surface area can be considerably smaller or larger when lake levels are lower or higher than normal. North America's Lake Superior is the world's largest freshwater lake by this measure.

    The other measure of a lake's size is the lake's water volume. By that measure, the world's largest freshwater lake is Lake Baikal in Siberia.

    You can find many of the world's largest lakes (acres) on Lakelubbers. There is no widely-accepted minimum surface area that defines a lake. What Lakelubbers describes as a lake, you might call a pond. The smallest lake that Lakelubbers currently includes is Hawaii's 2-acre Lake Waiau.


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    Water Level Control | LakeLubbers

    This is the organization that controls water releases or outflows from the lake or reservoir. In the USA, this is often the US Army Corps of Engineers, a power company, a municipal water system, an irrigation district, or a paper manufacturing company. In the case of private or gated lakes, a homeowners' association may be the lake's controlling authority.

    Many lakes cross borders, including North America's Great Lakes. The control of such lakes and their coveted freshwater may be amicably shared - or hotly disputed.

    "Water wars" continue at many lakes as growing populations and crop irrigation needs compete for the freshwater that lakes contain.


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    Lake Type | LakeLubbers

    There are 3 basic types of lakes that are currently included on LakeLubbers. 2 types may be dammed or not dammed, producing 5 classifications.

    - A Reservoir is a man-made freshwater lake that is usually created by damming rivers.

    - A Natural Freshwater Lake occurs naturally - often by glacial activity - and has a salinity of less than 30 parts per thousand. It may be dammed to produce electricity or for other reasons.

    - A Natural Saltwater Lake occurs naturally and has a salinity of more than 30 parts per thousand (ppt). It may be dammed.

    "Brackish" water may be categorized as freshwater or saltwater, depending on its salt content (salinity). Oligohaline water has less than 15 ppt of salt. Mesohaline water has 15-29 ppt. Polyhaline has 30-335 ppt.


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