There is no way that I'm aware of to easily locate questions that you have set bounties on in the past. It seems like there should be, however; perhaps under the "activity" tab.
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If you want the convenience of links, then I might suggest checking out the Stack Exchange Data Explorer to see if there's a query constructed to look for all posts that a specific user has posted a bounty on.
More complicated that you're asking for but:
You can go to your reputation graph, find the dip in your rep that corresponds to the creation of the bounty, select that part of the graph, and find the questions with the bounty docked in the side bar.
Of course this will start to get harder to do as you rep gets into the 15k range and 100 point moves stop showing up clearly on the graph... Unless you always offer big bounties, then you can put the problem back until you have circa 40-50k rep.
If you're referring to active bounties:
You could go to your "questions" tab and sort by date ("newest"). As bounty questions can't be older than seven days old, you should be able to locate bounty questions quickly because of the blue
For inactive bounties, I think the only way is indeed what dmckee suggests, selecting a period in the graph and scanning for three-digit red