Talk:Mälaren

Freshwater

Bridge Riksbron leading over one of the mouthes of Lake Mälaren.

Is this a freshwater lake? From the mmap, it looks like the channel leading into the Baltic Sea is wider than a river. Is the lake surface above sea level? jnestorius^(talk) 00:47, 16 November 2006 (UTC)

Mälaren is indeed a freshwater lake, appart from a very very small intake of seawater in Stockholm, whenever boats pass through from the sea.

On a more personal note, it's a very lovely lake in my oppinion, good for swimming, and if you feel like it, waterskiing. ^_^ I happen to live about five minutes away from it, in the town of Strängnäs. At the time of writing it is frozen as of two days ago, although the ice is very thin and I would not recommend trying to walk on it. Diablo65 19:22, 24 January 2007 (UTC)

*Agree*, it definitely is. I added an image here where you can see one of the wider discharges of the lake in central Stockholm, as you can see its not really wide, and the water normally flows resolutely in a single direction. The difference in level between the lake and the Baltic is however normally less than a metre in avarage (but varies seasonally and historically have occasionally been up to about 2-3 metres).

/ Mats Halldin (talk) 17:06, 12 March 2007 (UTC)

Mälaren's water level typically is 50-60 cms above the Baltic sea - not a whole lot, so there are regular occasions when there is 0 difference = concerns about salt water entering the lake thereby harming the drinking water supply for Stockholm and several other cities in the region. Chincoteague 08:36, 14 March 2007 (UTC)

The locks and the dam at Norrström are operated to minimize the risk of salt water entering Mälaren. However, the water-flow capacity between Mälaren and Saltsjön is somewhat limited, causing risk of flooding in Gamla stan like the flooding-incident in November 2000. —Preceding unsigned comment added by 130.237.216.122 (talk) 08:50, 9 July 2009 (UTC)

Also, because of the continous outflow from Mälaren the salinity of the inner Stockholm archipelago is quite low, so any "backflow" (a phenomenon I've never heard mentioned for this lake) would add very little salt. But notice that as the article mentions, Mälaren was connected to the Baltic sea less than 1,000 years ago. Considering the extreme narrowness of the few passages separating it from the outer archipelago (and the same outwards water flow as today), it probably wasn't very salty then either, but that's just a guess from my part. Tomas e (talk) 12:46, 9 July 2009 (UTC)

Major cities and municipalities bordering the lake

Hallstahammar is connected to Mälaren via Kolbäcksån, but it does not border Mälaren. Deleting. 95.195.212.121 (talk) 19:20, 28 November 2013 (UTC)

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