CORPUS CHRISTI — Some construction on the proposed Schlitterbahn water park and resort has begun — just not on Padre Island.

Materials are being prefabricated in New Braunfels — where the company opened its first water park in 1979 — said Gabriele Hilpold, chairwoman of the committee that advises the city on island development.

Members of the Island Strategic Action Committee said they’re baffled when they hear from people who still don’t believe the park and resort will become a reality.

But they may not hear as much of that by the end of October, when construction equipment is expected to arrive near the Padre Isles Golf Course, said developer Paul Schexnailder, of Asset Development. He briefed the committee Tuesday night.

Drawings and surveys are being completed, he said. Schexnailder wouldn’t say whether they’ve found a way to keep nine holes of the golf course open during construction — as hoped by some island residents — but said project details are being worked out.

The $41 million resort planned west of Park Road 22 tentatively is set to open in March 2014. Early designs showed the park would include a 65-acre water park with lodging, golf and restaurants. It will be built on the existing golf course and tied into a master plan for the area that includes a marina in Lake Padre, an extension of the residential canal system, hotels, condos and single-family homes on about 500 acres of mostly undeveloped land.

Under a $117 million incentive agreement with the city, Schlitterbahn must begin construction within five months and be finished with the first phase by summer 2013.

Schlitterbahn is part of a proposed $552 million master plan for the island, which investors Willard Hammonds, Schexnailder and the Henry family, owners of Schlitterbahn, are developing.