Judging from the positive comments at his Senate confirmation hearing, Robert W. Johnson, President Bush's pick to lead the Bureau of Reclamation, appears to be on his way to approval. Johnson has spent 31 years at the bureau, the last 11 as head of its Lower Colorado Region. After the Sept. 14 hearing, Sen. Larry Craig (R-Idaho) said it is his goal to see Johnson confirmed, perhaps at the end of September, before the Senate adjourns prior to the election.