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– Nøklevann (Norway) –

Lake name: Nøklevann Country: Norway GIG Region: N
GIG Type: LN2a Lake code: 006-2510-L Altitude(m a.s.l.): 163
Area (km²): 0.79 Mean depth (m): 11.3 Mixing regime: Stratified
Alkalinity (m eq/l): 0.19 Retention time (yr): N/A Chlorophyll a (µg/l): N/A
Total phosphorus (µg/l): 5 Eutrophication status: 1 - Low Hydromorphological status: 1 - Low


Nøklevatn is situated in a forest area close to Oslo in the south eastern part of Norway, Oslomarka, and is situated 164 m above sea level. The lake has a surface area of 0.8 km2, a mean depth of 11 m, a maximum depth of 34 m and the lake is oligotrophic. The lake has a highly recreational value for the local population, was previously used as drinking water supply and is still one of the reserve drinking water supply lakes of Oslo. The outlet of the lake was also used as water power for the sawmill Rustadsaga. The macrophytes are dominated by Persicaria amphibia, Myriophyllum alterniflorum, Juncus bulbosus, Nuphar lutea and Hippuris. In addition, there are populations of Utricularia, Callitriche hamulata and Isoetes lacustris.

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WISER: "Water bodies in Europe: Integrative Systems to assess Ecological status and Recovery"
Online: [date: 2022/12/04]
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