One of the state's most popular sight-seeing hikes closes today through Nov. 20 for maintenance and to remove potential rockfall hazards.

The closure of Diamond Head State Monument, which attracks about 600,000 residents and visitors each year, has been anticipated for months.

The state Department of Land and Natural Resources is performing the work, which comes with a $2.7 million price tag.

"It's a matter of public safety," said Michele Matson, a member of the Diamond Head Citizens' Advisory Committee. "We don't want a serious hazard. The trail system has been eroding for years and nothing has been done."

During the monthlong project, the public will have access to the crater, parking lot, restrooms and information booth area. The entire park will be closed, however, Nov. 13 to 20 when work begins on rock scaling above the Kahala Tunnel, which serves as the main entrance into the monument.

Visitors are being told of the closure at hotels, taxis, bus and rental-car companies. Notices will be posted at the park entrance and fliers will be distributed to frequent park users.

For more information, call the Division of State Parks at 587-0300 or visit www.hawaiistateparks.org.