At the Hautacam ski resort, take the road towards Col de Tramassel. Stop at one of the three car parks at the pass at the end of the asphalted section (inn and observation dome). In good weather, it is also possible to drive up to Col de Moulata.
(S/E) Leave the car park heading south.
(1) Take the path uphill on the left and rejoin the track.
(2) Follow it to the left to Col de Moulata and cross the small car park.
(3) At the end of the car park, take the path on the right.
(4) The path on the right descends to Lac d'Isaby. Take the path on the left, which runs parallel to it at first but then veers away to lead to Hourquette d'Ouscouaou. It follows a contour line for 400 metres, then climbs in successive stages to Hourquette d'Ouscouaou and towards Lac d'Ourrec.
Pass a concrete shelter further on and continue to the nearby Hourquette d'Ouscouaou (pass).
(5) From this pass, you can see the Pic du Midi de Bigorre and the Pic de Montaigu. Descend to the first bend to see Lac d'Ourrec below. Allow 20 minutes to half an hour to descend.
(6) Take the same route back in the opposite direction to return to the car park (S/E).
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