Otmuchów Lake is a dam reservoir and retention reservoir built in the years 1928 to 1933, known by the former name ''Staubecken Ottmachau'' and situated on the river

Nysa Kłodzka The Eastern Neisse, also known by its Polish name of Nysa Kłodzka (german: Glatzer Neiße, cs, Kladská Nisa), is a river in southwestern Poland, a left tributary of the Oder, with a length of 188 km (21st longest) and a basin area of 4,570& ...

, just to the North of the town

Otmuchów Otmuchów (pronounced: ; german: Ottmachau) is a town in Nysa County, Opole Voivodeship, Poland, with 6,581 inhabitants (2019). Etymology The city was mentioned for the first time as ''Otemochow'' in 1155. It was named in its Old Polish form ''Ot ...

. At the maximum level of damming at 18.6 metres the reservoir has an area of 20,6 km² and the capacity 130,45 hm³. The reservoir closes its drainage basin of the river Nysa Kłodzka at an area of 2352 km². The capacity was newly estimated in 2001 at 130,45 mln m³, after the river sedimentation in the reservoir had reached 215 metres. The ceremonial opening of the reservoir with the name ''Ottmachauer See'' and commissioning of the

hydroelectric power plant Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined an ...

occurred on the 17 June 1933. The four turbine hydroelectric power plant, located at the outflow, has two

Kaplan turbine The Kaplan turbine is a propeller-type water turbine which has adjustable blades. It was developed in 1913 by Austrian professor Viktor Kaplan, who combined automatically adjusted propeller blades with automatically adjusted wicket gates to ach ...

s with the power of 4.8 MW and supplies energy to the power grid of the country. The flow is at a rate of 2 × 21.5 m³/s at 16 m level difference. The reservoir belongs to the Kaskady Nysy Kłodzkiej, which is made up of four reservoirs: Topola Reservoir, Kozielno Reservoir making Paczkowski Lake, Otmuchów Lake and

Nyskie Lake Nyskie Lake ( pl, Jezioro Nyskie or ''Jezioro Głębinowskie'') is a reservoir constructed on the Nysa Kłodzka river in Poland in 1971. Its name comes from the nearby town of Nysa. The dam that was used to create the reservoir is 2 kilometers long ...

. Close by near the lake is located a unique national scale habitat of the

grey heron The grey heron (''Ardea cinerea'') is a long-legged wading bird of the heron family, Ardeidae, native throughout temperate Europe and Asia and also parts of Africa. It is resident in much of its range, but some populations from the more norther ...

. The reservoir is rich in fish, especially in

Zander The zander (''Sander lucioperca''), sander or pikeperch, is a species of ray-finned fish from the family Percidae, which includes the perches, ruffes and darters. It is found in freshwater and brackish habitats in western Eurasia. It is a popul ...

. To the other side of the town Otmuchów is located the Nyskie Lake. Around the area of the dam nest

Northern wheatear The northern wheatear or wheatear (''Oenanthe oenanthe'') is a small passerine bird that was formerly classed as a member of the thrush family Turdidae, but is now more generally considered to be an Old World flycatcher, Muscicapidae. It is th ...

s. There are

greater scaup The greater scaup (''Aythya marila''), just scaup in Europe or, colloquially, "bluebill" in North America, is a mid-sized diving duck, larger than the closely related lesser scaup. It spends the summer months breeding in Alaska, northern Canad ...

s, mainly velvet scooters,

long-tailed duck The long-tailed duck (''Clangula hyemalis''), formerly known as oldsquaw, is a medium-sized sea duck that breeds in the tundra and taiga regions of the arctic and winters along the northern coastlines of the Atlantic and Pacific Oceans. It is th ...

s or

common scoter The common scoter (''Melanitta nigra'') is a large sea duck, in length, which breeds over the far north of Europe and the Palearctic east to the Olenyok River. The genus name is derived from Ancient Greek ''melas'', "black", and ''netta'', "du ...

s and

red-throated loon The red-throated loon (North America) or red-throated diver (Britain and Ireland) (''Gavia stellata'') is a migratory aquatic bird found in the northern hemisphere. The most widely distributed member of the loon or diver family, it breeds prim ...

s and

black-throated loon The black-throated loon (''Gavia arctica''), also known as the Arctic loon and the black-throated diver, is a migratory aquatic bird found in the northern hemisphere, primarily breeding in freshwater lakes in northern Europe and Asia. It winter ...

s. In Eastern part of the reservoir in the more densely reeds and willow thickets there are three species of

grebe Grebes () are aquatic diving birds in the order Podicipediformes . Grebes are widely distributed freshwater birds, with some species also found in marine habitats during migration and winter. Some flightless species exist as well, most notably ...

little bittern The little bittern or common little bittern (''Ixobrychus minutus'') is a wading bird in the heron family, Ardeidae. ''Ixobrychus'' is from Ancient Greek ''ixias'', a reed-like plant and ''brukhomai'', to bellow, and ''minutus'' is Latin for "sm ...

spotted crake The spotted crake (''Porzana porzana'') is a small waterbird of the family Rallidae. The scientific name is derived from Venetian terms for small rails. The spotted crake's breeding habitat is marshes and sedge beds across temperate Europe into ...

s and

Western marsh harrier The western marsh harrier (''Circus aeruginosus'') is a large harrier, a bird of prey from temperate and subtropical western Eurasia and adjacent Africa. It is also known as the Eurasian marsh harrier. Formerly, a number of relatives were includ ...

s, and to the end of April there are

Savi's warbler Savi's warbler (''Locustella luscinioides'') is a species of Old World warbler in the grass warbler genus ''Locustella''. It breeds in Europe and the western Palearctic. It is migratory, wintering in northern and sub-Saharan Africa. This small ...

s species of bird. Various species also rest in the area and are the

Eurasian curlew The Eurasian curlew or common curlew (''Numenius arquata'') is a very large wader in the family Scolopacidae. It is one of the most widespread of the curlews, breeding across temperate Europe and Asia. In Europe, this species is often referred ...

s, Northern lapwings,

grey plover The grey plover or black-bellied plover (''Pluvialis squatarola'') is a large plover breeding in Arctic regions. It is a long-distance migrant, with a nearly worldwide coastal distribution when not breeding. Taxonomy The grey plover was forma ...

s and

dunlin The dunlin (''Calidris alpina'') is a small wader, formerly sometimes separated with the other "stints" in the genus ''Erolia''. The English name is a dialect form of "dunling", first recorded in 1531–1532. It derives from ''dun'', "dull brown ...

s and

curlew sandpiper The curlew sandpiper (''Calidris ferruginea'') is a small wader that breeds on the tundra of Arctic Siberia. It is strongly migratory, wintering mainly in Africa, but also in south and southeast Asia and in Australia and New Zealand. It is a v ...

s. There are also

ruddy turnstone The ruddy turnstone (''Arenaria interpres'') is a small cosmopolitan wading bird, one of two species of turnstone in the genus ''Arenaria''. It is now classified in the sandpiper family Scolopacidae but was formerly sometimes placed in the plov ...

Eurasian oystercatcher The Eurasian oystercatcher (''Haematopus ostralegus'') also known as the common pied oystercatcher, or palaearctic oystercatcher, or (in Europe) just oystercatcher, is a wader in the oystercatcher bird family Haematopodidae. It is the most widesp ...

s and

red-necked phalarope The red-necked phalarope (''Phalaropus lobatus''), also known as the northern phalarope and hyperborean phalarope, is a small wader. This phalarope breeds in the Arctic regions of North America and Eurasia. It is migratory, and, unusually for a ...

References

{{DEFAULTSORT:Otmuchow Lake LOtmuchow Reservoirs in Poland 1933 establishments in Poland Nysa County Lakes of Opole Voivodeship