Recycling site closures have led to a rise in fly-tipping in and around Ilkley, residents say.
The land is now classified as "grey belt" and a 60-home development has been given approval.
Six people are due in court following the raids in Bradford and Halifax on Thursday, police say.
About 150 people gathered at Queensbury Tunnel near Bradford to protest a decision to fill it in.
Campaigners who want to reopen tunnel have been lobbying to challenge plans to make it inaccessible.
Police say she has life-threatening injuries, as a 39-year-old man remains in custody.
National Highways will seek planning consent from Bradford Council to fill in Queensbury Tunnel.
The beauty spots help boost biodiversity across Bradford, according to Natural England.
Sport England says cricket balls from a nearby club could hit people at the housing development.
