Lake Dillon, Colorado, USA

Lake Locations:

USA - West - Colorado - Northwest -

Also known as:  Dillon Reservoir

Nestled in the middle of some of Summit County’s best skiing, Lake Dillon is the perfect year round getaway. With its rich history, fantastic sport fishing, and easy access to world class skiing, the lake or Dillon Reservoir as it’s sometimes known, is sure to become a family favorite.

The original town of Dillon was typical for its time period, springing up during the mineral boom of the 1800’s. Located at the junction of three rivers, the Blue River, Snake River, and Tenmile Creek, Lake Dillon enjoyed an uninterrupted history until the early 1960’s, when the entire town was relocated for the construction of the Dillon Dam and Reservoir. The old town, hydroelectric plant, cemetery, and many historical buildings were moved to the present site of the town. Today, visitors to Dillon Reservoir can tour some of the old buildings including a school house from 1883 that currently houses the Summit Historical Society Museum. There are also scenic historic boat tours offered on Lake Dillon.

Completed in 1963, Lake Dillon is the largest facility in the Denver Water System. Dillon Dam is an earth-filled dam that diverts water from the Blue River Basin, through the Harold D. Roberts Tunnel, under the Continental Divide, and into the South Platte River Basin. Managed by Denver Water, the reservoir levels are lowered in the fall to accommodate the expected snowfall, sometimes reaching as high as 26 feet.

The snow is Summit County’s biggest draw, beckoning skiers from all over the world. Lake Dillon is conveniently located between Keystone, Copper Mountain, Vail, Arapahoe Basin, and Breckenridge ski resorts. Visitors to Lake Dillon can participate in all kinds of winter sports including downhill and cross-country skiing, and when the lake freezes, ice fishing.

The fun isn’t limited, however, to just the winter sports. Although water contact sports like swimming and waterskiing are prohibited on the lake, sports enthusiasts can sailboard in full wet or dry suits, and boating and sailing are popular activities. Visitors can also rent canoes and kayaks at one of the lakes’ many outfitters. Anglers will find challenging sport fishing for rainbow and brown trout. There is also a healthy population of Kokanee salmon, and the Blue River below Dillon Dam is popular with stream and fly fishermen who have been known to catch trout over 24 inches long. Dillon Yacht Club lays claim to being the “highest elevated club in North America,” and Lake Dillon Water Taxi makes a similar claim.

The Gore, Williams Fork, and Tenmile mountain ranges with peaks as high as 13,300 feet, provide the perfect backdrop for hiking around Lake Dillon. The Sapphire Point Trail in particular leads to a scenic overlook, looking down on the lake. There are high alpine roads, historic byways, as well as several campgrounds run by the Forest Service. Nearby in the Eagles Nest Wilderness Area, hikers can see black bear, elk, moose, mule deer, and even the occasional mountain lion.

With its beautiful water, majestic mountain ranges, and world class snow sports, Lake Dillon is a spectacular year round destination.

Things to do at Lake Dillon

  • Vacation Rentals
  • Fishing
  • Ice Fishing
  • Boating
  • Sailing
  • Swimming
  • Canoeing
  • Kayaking
  • Water Skiing
  • Camping
  • Campground
  • Hiking
  • Cross-Country Skiing
  • Wildlife Viewing
  • Birding
  • Museum

Fish species found at Lake Dillon

  • Brown Trout
  • Kokanee Salmon
  • Salmon
  • Trout

Lake Dillon Photo Gallery

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Lake Dillon Statistics & Helpful Links

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Lake Type: Artificial Reservoir, Dammed

Water Level Control: Denver Water

Surface Area: 3,233 acres

Shoreline Length: 27 miles

Normal Elevation (Full Pond): 9,009 feet

Minimum Elevation (Min Pond): 8,971 feet

Maximum Elevation (Max Pond): 9,017 feet

Average Depth: 79 feet

Water Volume: 234,763 acre-feet

Completion Year: 1963

Lake Area-Population: 802

Drainage Area: 329 sq. miles

Trophic State: Primarily Oligotrophic

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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".

You can find many of the world's highest-elevated lakes on LakeLubbers. Lakes with the lowest elevations (known by LakeLubbers) are shown on the final page of that list.


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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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