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{{Infobox river
| name              = Jamagne
| image             = La Jamagne (Rivière).JPG
| image_size        =
| image_alt         =
| image_caption     = The Jamagne at Kichompré
| pushpin_map       = France#France Grand Est
| source1_location  = [[Lac de Gérardmer]]
| mouth             = [[Vologne]]
| mouth_coordinates = {{coord|48.0933|6.884|display=inline,title}}
| progression       = {{RVologne}}
| subdivision_type1 = Country
| subdivision_name1 = France
| location          =
| length            = {{convert|6.9|km|mi|abbr=on}}
| source1_elevation = {{convert|660|m|ft|abbr=on}}
| mouth_elevation   = {{convert|620|m|ft|abbr=on}}
| discharge1_avg    =
| basin_size        = {{convert|24.6|km2|mi2|abbr=on}}
| river_system      =
| tributaries_left  =
| tributaries_right =
}}
The '''Jamagne''' is a short river of {{convert|6.9|km|mi}},<ref name=sandre>{{Sandre|A4300680|La Jamagne}}</ref> an emissary of the [[lac de Gérardmer]] which is its source. It flows into the [[Vologne]] as a [[left tributary]] at Kichompré.
== Etymology ==
The name Jamagne came from ''Ja-magna'' meaning "already big" by analogy with its outlet from the lake.
== Geography ==
The course of the Jamagne is largely [[canalized]] and [[wikt:rectilinear|rectilinear]] when it flows through the [[Gérardmer]] area,<ref>{{cite web
|url=http://www.geoportail.fr/
|title=Géoportail
|author=[[Géoportail]] - [[Institut Géographique National (France)]]
|year=
|editor=
|accessdate=18 February 2011
}}</ref> following the construction of [[Route nationale|Route nationale 417]] in 1950. The river suffered from serious domestic pollution until 1998.
When the [[Cleurie (river)|Cleurie]] river valley was blocked by [[Würm glaciation|Würmian]] [[moraine]] in a double [[:wikt:vallum|vallum]] {{convert|50|m|ft}} thick, the waters of the Hohneck massif stopped flowing towards [[le Tholy]] and accumulated upstream of the deposit, forming the [[lac de Gérardmer]]. With no outlet to the west, the waters left the lake in the opposite direction to their historic one, via the Jamagne, which flows into the Vologne downstream of the [[hamlet (place)|hamlet]] of Kichompré.
The flow of the Jamagne was widely exploited during the 20th century for [[hydroelectricity|generating electricity]] as well as for powering [[sawmill]]s which were set up on its banks.
In contrast to other rivers of the Vosges, the Jamagne is unique in flowing from southwest to northeast.
==Tributaries==
The Jamagne's principal tributary is the Basse des Rupts, also known as the Forgotte. However the lac de Gérardmer is fed by four main streams:
* The Cheny stream (to the east)
* The Chêne stram (to the north)
* The Phény stream (to the south)
* The Mérelle stream (to the west)
According to the [[Sandre]] website, the Mérelle stream is identified as the mother branch of the Jamagne upstream of the lac de Gérardmer. Nonetheless, the path of the Phény stream accumulated with the lower part of the Jamagne amounts to a total length of {{convert|9|km|mi|0}}.
==Hydrology==
It appears that the fluctuations in flow rate of the Jamagne have never been studied. The flow of the river has been regulated since the beginning of the 20th century by a system of [[valve]]s located at the outlet of the lac de Gérardmer.
==References==
<references />
[[Category:Rivers of France]]
[[Category:Rivers of Grand Est]]
[[Category:Rivers of Vosges (department)]]