What do yellow stakes in golf mean?

Answer 1

Blue stakes on a Golf course indicate "ground under repair". They may be blue with a green top which would indicate that an appropriate government agency has declared the area an "environmentally-sensitive area" and the local golf committee has declared it ground under repair to prevent play from it.

Answer 2

Red stakes indicate a lateral water hazard.

Answer 3

Out of bounds.

Answer 4

hazard