Totesee

{{Infobox body of water

| name = Totesee

| image = VS-65-06.jpg

| caption =

| image_bathymetry =

| caption_bathymetry =

| location = Grimsel Pass, Valais

| coords = {{coord|46|33|37.05|N|8|20|22.91|E|type:waterbody_region:CH-VS|display=inline,title}}

| type = natural lake, reservoir

| inflow =

| outflow =

| catchment =

| basin_countries = Switzerland

| length =

| width =

| area = {{convert|18|ha|abbr=on}}

| depth =

| max-depth = {{convert|34|m|abbr=on}}

| volume = {{convert|2.5|e6m3|acre.ft|abbr=out}}

| residence_time =

| shore =

| elevation = {{convert|2,160|m|abbr=on}}

| islands =

| cities =

| pushpin_map=Canton of Valais#Canton of Bern#Switzerland#Alps

| pushpin_label_position= bottom

| pushpin_relief = y

| embedded = {{Infobox mapframe |wikidata=yes |zoom=15 |coord={{WikidataCoord|display=i}}}}

}}

__NOTOC__

Totesee (Germanized: Totensee) is a small natural lake ({{convert|18|ha|abbr=on|disp=or}}) at the Grimsel Pass in Switzerland. The lake lies immediately to the south of the natural watershed and cantonal boundary at the pass. It is therefore in the canton of Valais, and it would naturally drain into the river Rhône in the valley below. However a dam has been constructed to enable its use as a reservoir, increasing its size and raising its level by {{convert|16|m}}. As part of this work, an aqueduct supplies water to the Grimselsee, which drains into the river Aare and thus forms part of the Rhine catchment.{{cite map |url=https://s.geo.admin.ch/73b32384b1 |agency=Swiss Confederation |title=Totesee |map=1250 - Ulrichen |map-url=https://shop.swisstopo.admin.ch/en/products/maps/national/lk25?layer=ch.swisstopo.landeskarte25_papier.metadata&product=1250&productIdentifier=1250&childGroupIdentifier=lk25eb#product-1250 |scale=1:25'000 |series=National Map 1:25'000 |edition=2014 |date=2012 |publisher=Federal Office of Topography – swisstopo |location=Wabern, Switzerland |isbn=978-3-302-01250-6 |via=map.geo.admin.ch |access-date=2017-06-05}}{{cite web |title=Water catchment area |url=http://www.grimselstrom.ch/home/download/1543 |publisher=Kraftwerke Oberhasli AG |access-date=2017-06-06 |archive-date=2017-06-06 |url-status=live |archive-url=https://web.archive.org/web/20170606093152/http://www.grimselstrom.ch/home/download/1543}}

In November 2006, the lake's entire trout population died, possibly due to algae.{{citation needed|date=June 2017}}

The name Totensee (also: Lake Toten, literally "Lake of the Dead") is said to be derived from soldiers of Duke Berchtold V of Zähringen driven into the lake by the people of Valais after the Battle of Ulrichen in 1211.{{citation needed|date=June 2017}}