An early-morning fire Thursday demolished two structures in Fort Seward and claimed about $80,000 in property, but fireman Al Badgley said the damage could have been much worse.

  The fire incinerated a 24-by-24-foot workshop and small garden shed belonging to Leo and George Ann Smith around 7:30 a.m. Thursday. The blaze also destroyed an adjoining boathouse, containing a Boston Whaler pleasure craft complete with brand-new motor.

  Leo Smith said he was burning grass…