Rogsån is a small creek in central Sweden, that despite a long history of logging, mining, and being cut-off at both ends by dammed lakes, host a relatively rich ecosystem. The water runs from the clear and oligotrophic lake Rog in the north, down past several dams of varying sizes, into lake Varpan about 8km to the South. The stream changes character from a strong flow and a pool-and-riffles section below the outlet of lake Rog, to more of a lowland type with slower water and plenty of waterlilies in the lower sections.
Fish diversity is quite low; with perch (Perca fluviatilis), pike (Esox lucius), and roach (Rutilus rutilus) being the most common species, but with trout (Salmo trutta) and miller’s thumb (Cottus gobio) found occasionally. Plant diversity is a bit more impressive with Juncus bulbosus meadows, “forests” of waterlilies, and patches of Chara sp., Utricularia intermedia, Myriophyllum alterniflorum, Lobelia dortmanna, and more.
- GPS
- 60.7102814, 15.6052961
- Geographical region
- Northern Europe
- Drainage Basin
- Mälaren Lake
- River catchment
- Dalälven River
- Water body type
- Creek
- Water body name
- Rogsån
- Water body part
- Outflow
- Water body course
- Upper course
- Water body: tributary of
- Tributary name
Videos above and below water
