The lake's outflow, at 840 m (2,760 ft) above sea level, is the River Gutach, which merges with the Haslach stream below Kappel to form the Wutach.

On the north shore lies the spa town of the same name, today a part of the municipality of Titisee-Neustadt.

In addition, it is possible that a moraine (deposit of rock material that is transported with the glacier) prevents the runoff.

[4] In the valleys around the Titisee (Altenweg, Spriegelsbach, Schildwende and Jostal), people usually worked in the agricultural sector, breeding cattle.

At the beginning of the 20th century, the construction of the Höllentalbahn and the onset of tourism led to a central village emerging at the lake.

[13] The Titisee takes a long time to freeze over in the winter owing to the winds, which keep the surface of the water moving almost all continuously.

When conditions appear favourable for the opening the lake, daily ice measurements are taken by the Titisee-Neustadt municipal authorities at three or four places.

On 14 January 1966, a tractor with a snowplough was clearing the landing strip of snow when it broke through the ice and sank to the bottom of the lake, taking the driver, Walter Wilde (29), with it.

[14] In the nutrient-poor Titisee there are large predatory fish (pike-perch, sea trout and a large stock of pike), schooling fish (whitefish, roach and perch) as well as carp, chub and tench in shallower areas.