Räterichsbodensee

Räterichsbodensee
Name	Räterichsbodensee
Location	Canton of Bern, Switzerland
Type	Reservoir
Basin countries	Switzerland
Area	0.67 km²
Max-depth	77 m
Volume	25.6e6 m³
Elevation	1,767 m

Räterichsbodensee is an alpine reservoir in the Canton of Bern in the Bernese Oberland region of Switzerland, created by a dam on the Kander and situated near the Kandersteg valley and the Gemmi Pass. The reservoir lies within the Alps and is part of the Kandersteg–Goppenstein hydropower complex, serving hydroelectric facilities operated by regional energy companies and municipal authorities. It is surrounded by notable peaks and passes including the Bunderchrinde, Blümlisalp, and approaches toward Lauterbrunnen and Leysin that make it relevant for alpine transportation and tourism networks.

Geography

Räterichsbodensee sits at approximately 1,767 metres above sea level in the Bernese Alps near the boundary with the Canton of Valais and the Canton of Fribourg-adjacent ranges. The reservoir occupies a glacially carved basin in the upper catchment of the Kander and is flanked by ridgelines linking to the Doldenhorn, Adelboden, Wildstrubel, and Schwarzhorn massifs. Nearby localities and transport hubs include Kandersteg, Frutigen, Spiez, Interlaken, and the Lötschberg Tunnel corridor. The reservoir surface is within a mountainous landscape characterized by alpine meadows (alpage), rock faces associated with the Silberhorn-type formations, and watersheds that also drain toward the Rhône via connecting valleys and passes like the Gemmi Pass.

History and construction

Plans for harnessing the Kander for hydroelectricity date to early 20th-century developments in Swiss energy policy and the expansion of companies such as BKW (Bernische Kraftwerke AG), Electrowatt, and regional cooperatives. Construction of the dam and reservoir was undertaken in the mid-20th century by contractors linked with Swiss civil engineering firms and influenced by engineering practices developed on projects like the Grande Dixence Dam, Emosson Dam, and Mauvoisin Dam. The reservoir’s creation involved negotiations with the Canton of Bern, local municipalities including Kandersteg and Frutigen, and national regulatory bodies such as the Federal Office of Energy (Switzerland). Engineering innovations mirrored those used on other Alpine storage projects like Lac de Tseuzier and the Linth–Limmern scheme, with acoustic surveying, rock stabilization, and transport by aerial tramways comparable to installations on Pizol and Saas-Fee construction sites.

Hydrology and reservoir management

The hydrology of the reservoir is governed by inflows from the Kander and subsidiary alpine streams fed by snowmelt and glacial runoff from ranges including the Blüemlisalp and Wildstrubel, with seasonal variability similar to basins draining to the Rhine and Rhone. Management protocols are coordinated among operators, notably companies like BKW and municipal water authorities, guided by water law frameworks of the Federal Office of the Environment (FOEN) and cantonal statutes. The reservoir contributes to peak-shaving and load balancing in Switzerland’s interconnected grid involving Swissgrid and cross-border exchanges with networks linked to France, Germany, and Italy. Techniques such as pumped storage coordination, sediment management comparable to operations at Lac de Mauvoisin, and ecological flow prescriptions adopted in arenas like Lake Geneva are applied to maintain downstream discharge regimes toward Frutigen and Thun.

Ecology and environment

The site lies within alpine ecosystems hosting species and habitats protected under cantonal ordinances and influenced by international frameworks like the Bern Convention and Ramsar Convention principles. Vegetation zones include montane and subalpine communities found also in locations such as Jungfrau-Aletsch and Gantrisch, supporting flora like Edelweiss-associated taxa and fauna comparable to populations in Swiss National Park areas, including chamois and alpine marmot, and avifauna resembling that recorded at Lake Oeschinen and Lac de Derborence. Environmental monitoring involves collaboration with institutions such as the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL) and universities like the University of Bern and ETH Zurich to assess water quality, sedimentation, and impacts on migratory fish species noted in studies of Alpine reservoirs like Lac de Salanfe and Lake Thun. Conservation measures coordinate with regional initiatives including the Alpine Convention to mitigate climate-change-driven glacial retreat observed across the Alps.

Recreation and tourism

The reservoir and surrounding trails attract visitors traveling via hubs such as Kandersteg, Interlaken, and Lauterbrunnen, linking with long-distance routes like the Alpine Pass Route and local paths toward Gemmi Pass and the Adelboden area. Activities include hiking, mountaineering on adjacent faces like Doldenhorn, alpine skiing accessible from resorts such as Adelboden and Grindelwald in winter, and photography similar to tourism patterns at Lake Oeschinen and Lauterbrunnen Valley. Accommodation and services in nearby communities involve establishments comparable to those in Kandersteg and Frutigen, and the reservoir forms part of itineraries promoted by cantonal tourist offices and national guides including publications from Switzerland Tourism and regional conservation trusts.

Infrastructure and access

Access to the reservoir is typically via road and trail networks connected to Kandersteg and Frutigen, with public transit links provided by BLS AG rail services on corridors serving Spiez–Interlaken and bus connections to mountain passes akin to routes to Saanenmöser. Support infrastructure includes service roads, aerial cableways, and maintenance facilities similar to installation patterns at Mürren and Saas-Fee, and emergency coordination involves agencies like Swiss Air-Rescue (Rega) and cantonal police forces. Energy transmission ties into high-voltage lines managed by Swissgrid feeding substations that interface with international interconnectors to ENTSO-E grids and regional distribution by companies such as BKW and municipal utilities.

Category:Lakes of the canton of Bern Category:Reservoirs in Switzerland