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At a stream in Allgäu/Bavaria early September.
Initially thought of Ephydridae, but the antenna suggests otherwise. Don't see enlarged hind tarsi, however

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It is Sphaeroceridae, and those that look like ephydrids and live by a stream often turn out to be Pseudocollinella, but let's wait for the experts!

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Thanks Tony! If so, then two species would be possible according to FE:
P. septentrionalis or P. humida

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Looks like P. humida there is also P. jorlii which seems (just from personal records) to be more inclined to be found in sandier areas and also appears paler with more yellow around leg joints and coxa. The defining difference between the two is that P. jorlii has a shorted distal postero-dorsal bristle which unfortunately isn't visible here.

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Thanks for the input. Apparently, P jorlii is extending its range north, so it might be worth to have a closer look at those specimen.

Where should the bristle be located - on a leg?

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on tibia 2, the bristle is almost opposite the antero-dorsal towards the tip of the tibia, in humida they are of equal length, in jorlii the postero-dorsal is around half the length of the antero-dorsal. Carles Tolra and Paul Gatt have papers describing jorlii - I've emailed you