We were looking for the Groenkloof Nature Reserve and had taken the wrong freeway off ramp and stumbled across the Centurion Lake Golf Course. Here is a panoramic shot of the dam:

Here are all the birds that we saw: African Hoopoe; Mallard; Glossy Ibis; Egyptian Goose; African Palm Swift; Rock Dove; Yellow-billed Duck and Rock Martin. Here are two pics worth sharing: