| Crummock Water | |
| Image Bathymetry: | Crummock Water.jpg |
| Caption Bathymetry: | map (1925) |
| Location: | Lake District, Cumbria |
| Coords: | 54.55°N -21°W |
| Type: | Ribbon |
| Inflow: | Buttermere Dubs |
| Outflow: | River Cocker |
| Pushpin Map: | United Kingdom Lake District#United Kingdom Allerdale |
| Pushpin Map Caption: | Location in the Lake District National Park##Location in Allerdale, Cumbria |
| Basin Countries: | United Kingdom |
| Length: | 2.5miles |
| Width: | 0.6miles |
| Area: | 2.57km2 |
| Max-Depth: | 140feet |
| Shore: | 6.26miles |
| Elevation: | 96m (315feet) |
| Islands: | 6 |
Crummock Water is a lake in the Lake District in North West England. It is long, wide, deep, and has an area of 2.5km2. The lake's primary inflow is Buttermere Dubs, itself the outflow of Buttermere, and its outflow is the River Cocker, which meets the River Derwent at Cockermouth before entering the Irish Sea at Workington. It is in the unitary authority of Cumberland and the ceremonial county of Cumbria. It is in the parish of Buttermere, and its western shore forms part of the western boundary of the parish.
The hill of Mellbreak runs the full length of the lake on its western side; as Alfred Wainwright described it 'no pairing of hill and lake in Lakeland have a closer partnership than these'. The lake is owned by the National Trust.
Scale Force, the highest waterfall in the Lake District, feeds the lake and has a drop of .[1]
"The meaning of 'Crummock' seems to be 'Crooked one', from British" (Brythonic Celtic) "'crumbaco'-'crooked'". This may refer to the winding course of the River Cocker, which flows out of the lake, or refer to the bending nature of the lake itself. The word "'water' is the main Lakeland term for 'lake'".[2]
Water from the lake was treated at Cornhow water treatment works, near Loweswater,[3] and was distributed to the towns of Silloth-on-Solway, Maryport, Workington, and many smaller towns, villages, and hamlets in the surrounding area for drinking and all other uses.[4] This use ceased in October 2022 with the commissioning of the United Utilities pipeline to bring supply from Thirlmere.[5]
Crummock Water gained attention in 1988 when the body of Sheena Owlett was found in the lake. It later transpired she had been murdered in Wetherby, West Yorkshire.