The reservoir was formed between the cities of Bulle and Fribourg, by building the Rossens Dam on the Sarine river in 1948.

The arch dam has a height of 83 m and a crest length of 320 m. The reservoir filled in about four months after completion.

The remains of the castle of Pont (or Pont-en-Ogoz) and a chapel are located on the Ile d'Ogoz, one of the five islets in the lake.

The bridge has a total length of 2043 m and crosses three valleys, including two arms of the lake.

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