From Pathfinder Kingmaker, which isn't enabled.

Rickety Bridge

HAZARD 4

Stealth +12

Description The bridge creaks and strains alarmingly.

Disable DC 25 Crafting to Repair the bridge as an individual hexploration activity.

Collapse

Trigger Two or more Medium creatures or a Large or larger creature crosses the bridge

Effect The bridge collapses. The triggering creature(s) fall into the river below, taking no damage from the fall itself due to the deep water, but taking 2d8 + 5 bludgeoning damage (DC 21 basic Reflex) from falling debris. For 1 round after the collapse, the waters below the bridge churn violently, requiring a DC 20 Athletics check to Swim.

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