Entrance fees are due to rise at many national parks over the next three summers, though a public outcry over specific increases could cause the government to reconsider.A few increases have already taken effect.
Through 2009, the National Park Service plans to phase in higher rates for annual park passes and fees paid per vehicle or person at about 130 of the 390 parks, monuments and other areas the agency manages.
The government does not collect any fees at the other two-thirds of sites in the park system.
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