I'm looking for a children's book suitable for 10-12 years old, maybe a little older and was available early to mid-1970s.
The plot centers around two boys (possibly brothers) who are too scared to cross a covered bridge at night because of a monster they might encounter. I think the monster was short & round with arms & legs, like a ball with limbs.
The only children's story I can think of about a "monster" under a bridge is the classic "Three Billy Goats Gruff" which has been around a long time. Probably not what you're looking for though. Just thought I would throw it out there.
