Related Clues:

• Obstructs
• Cage features
• Obstacles
• Graph components
• Emulates beavers
• Blocks up
• Beavers' creations
• Word with monkey or parallel
• River barriers
• They may be parallel or uneven
• Glen Canyon and Grand Coulee, e.g.
• Measures of cell-phone signal strength
• River blockers
• Kid producers
• Captains sport them