This is a post from M1-Gunner on the WA website. This important vote is coming up as soon as next week and will correct the oversight from 2009 legislation allowing guns in National Parks.

Army Corp Gun Ban Repeal Vote Coming This Week in the House Legislation

The Gosar amendment, modeled after the Recreational Lands Self-Defense Act (H.R. 1865) introduced by pro-gun Rep. Bob Gibbs (R-OH), is similar to a 2009 law repealing the gun ban on National Park Service land. Army Corps of Engineers land was not part of that bill, something the Corps was quick to point out after that law took affect.
The Corps said, in a statement: “Public Law 111-024 does not apply to Corps projects or facilities . . . [and the Army Corps] will continue to prohibit loaded concealed weapons on Corps properties regardless of the new law and notwithstanding any contrary provisions of state law.”

The amendment will reverse the Corps’ decision and remedy the “oversight” of the lands bill.
“The Recreational Lands Self-Defense Act is a bipartisan effort that seeks to correct this oversight and restore Second Amendment rights to law-abiding citizens while they are legally camping, hunting, and fishing on the 11.7 million acres of Army Corps recreational property,” Rep. Gibbs said.

Rep. Gosar notes that “this amendment will restore continuity to federal lands and ensure that constitutional rights are consistently protected.”

Nationally, the Army Corps of Engineers controls 400 lake and river projects, 90,000 campsites and 4,000 miles of trails. A vote on the Gosar amendment could come as early as Thursday.

About halfway down in the Ammoland link above is an 'ACTION" link to take you directly to send a message to your congressman.