[3] Construction of a dam on the Dorlay by the town of Rive-de-Gier was discussed in 1884 but the project was abandoned due to cost.

[6] Today's Barrage du Dorlay [fr] is located at 45°26′36″N 4°34′42″E / 45.443302°N 4.578356°E / 45.443302; 4.578356 on the river between Doizieux and La Terrasse-sur-Dorlay.

The dam has a storage capacity of 2,500,000 cubic metres (88,000,000 cu ft), with a catchment area of about 24.4 square kilometres (9.4 sq mi).

[4] The dam supplies potable water to the municipalities of La-Terrasse-sur-Dorlay, Lorette, Chateauneuf, Chagnon, Cellieu, St-Paul-en-Jarez, La Grand-Croix and part of Rive-de-Gier.

[10] In 1838 the Saint-Philippe mines were sunk on the right bank of the Dorlay to a depth of 170 metres (560 ft), but did not find any significant coal deposits.