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Bassenthwaite Lake is a body of water in the Lake District in North West England, near the town of Keswick. It has an area of 5.3 km2 (2.0 sq mi), making the fourth largest of the lakes in the region. The lake has a length of approximately 4 miles (6.4 km) long and maximum width of 0.75 miles (1 km), a maximum depth of 19 m (62 ft), and a surface elevation of 68 m (223 ft) above sea level. Its primary inflow and outflow is the River Derwent, which drains into the Irish Sea at Workington. The lake is in the unitary authority of Cumberland, and the ceremonial county of Cumbria.
| Bassenthwaite Lake | |
|---|---|
 View from Blackstock Point | |
  Bassenthwaite Lake Location in the Lake District National Park | |
 Map (1925) | |
| Location | Lake District |
| Coordinates | 54°39′N 3°13′W |
| Primary inflows | River Derwent Newlands Beck |
| Primary outflows | River Derwent |
| Catchment area | 96.5 sq mi (250 km2)[1] |
| Basin countries | United Kingdom |
| Max. length | 4 mi (6.4 km) |
| Max. width | 0.8 mi (1.3 km) |
| Surface area | 1.98 sq mi (5.1 km2) |
| Max. depth | 70 ft (21 m) |
| Shore length1 | 11.3 mi (18.2 km) |
| Surface elevation | 223 ft (68 m) |
| Islands | 0 |
| 1 Shore length is not a well-defined measure. | |
Bassenthwaite Lake is the only body of water in the Lake District to use the word 'lake' in its name, all the others using the local terms 'water' (e.g. Derwentwater), 'mere' (e.g. Windermere) or 'tarn' (e.g. Dock Tarn). Some maps dating from the 18th century do in fact mark this lake with the name Bassenwater,[citation needed] and the use of the name Broadwater for this lake is also attested.[citation needed]
The A66 dual carriageway runs roughly north–south along the western side of the lake. The lay-bys are popular spots for photographers and bird watchers looking for osprey. The section running south towards Keswick was built along the course of the former Cockermouth, Keswick and Penrith railway line.
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Like the other Lake District lakes, Bassenthwaite Lake lies in a glacially eroded valley, left after the last glaciation. Bassenthwaite Lake is linked to Derwent Water by the River Derwent, which crosses the 3 miles (5 km) alluvial plain between the two lakes. There has been speculation that Derwent Water and Bassenthwaite Lake were once one larger lake with the alluvial flats now separating them formed from partial infill of the original basin.[citation needed]
The lake takes its name from the village of Bassenthwaite, meaning "Bastun's clearing". Bastun is usually taken to be an Anglo-French nickname or surname originally meaning "stick", while thwaite is from Old Norse þveit ("clearing"). The lake was also formerly known as Bastun's water.[2]
The lake's catchment is the largest of any lake in the Lake District. This, along with a large percentage of cultivable land within this drainage area, makes Bassenthwaite Lake a fertile habitat.[citation needed]
The lake contains salmon, trout, pike, perch, minnow, dace, ruffe and eel, though the predominant species is roach, which is believed to have been introduced in the form of discarded live-baits by visiting pike anglers. Also present was the vendace, until it was declared extinct within the lake in 2001.[citation needed]
Birdlife
Cormorants have been known to fish the lake and herons can also be seen; at the turn of the 19th century there was a report of 60 nests in a heronry in nearby Wythop Woods.[citation needed]
Lake District Osprey Project
In 2001, ospreys returned to nest in the Lake District after more than a hundred years. They nested by the lake, and have done so regularly since. The osprey family can be watched from viewpoints at Dodd Wood and by CCTV from Whinlatter Forest Visitor Centre.[3]
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Water quality is adversely affected by high sediment deposition, and there are other problems such as phosphate pollution. These issues are being addressed via the Bassenthwaite Lake Restoration Programme.[4][5] To reduce the sediment entering the lake more trees have been planted alongside watercourses, and clear felling of existing tree cover has been discouraged with the cooperation of Forestry England.
Phosphates encourage algae formation.[4] The Environment Agency attributed unacceptable levels of phosphate in the catchment to Keswick wastewater treatment works, Greta Grove pumping station and the associated overflow.[6] Water company United Utilities was fined £27,000 in 2011 for allowing raw sewage to pollute nearby Pow Beck watercourse.[7] The company's £20 million sewer improvement scheme, begun in 2011, aims to improve water quality in the River Greta[8] and the lake itself.[9] The project will facilitate removal of greater quantities of phosphates.[10] Works to upgrade the wastewater treatment works and pumping station were begun in May 2010.[6]
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It has been reported that the wide gravel spreads between Derwent Water and Bassenthwaite Lake provided the best centre within Lakeland for Neolithic farming communities. Stone axes have been found in the area and particularly at Mossgarth, Portinscale.[citation needed]
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