MONITORING SUMMARY TABLE
Earliest and most recent monitoring dates are summarized here. For detailed monitoring information, see the Monitoring History Database.

Site NameEarliest DateMost Recent Date
Abraham Lincoln Birthplace National Historic Park - Knob Creek High07/13/200508/03/2005
Abraham Lincoln Birthplace National Historic Park - Visitor's Center04/13/200611/03/2014
Acadia National Park - McFarland Hill02/08/199805/18/2019
Agate Fossil Beds National Monument - Residence Area07/27/200709/30/2009
Assateague Island National Seashore - Maintenance Area06/16/200510/05/2010
Badlands National Park - Visitor Center10/01/198712/31/2017
Big Bend National Park - K-Bar Ranch Road09/15/199005/18/2019
Blue Ridge Parkway - 7510 Blue Ridge Parkway04/01/200312/31/2008
Blue Ridge Parkway - Barnet Knob Firetower Road04/02/200310/31/2007
Blue Ridge Parkway - Blue Ridge Parkway04/01/200305/31/2006
Blue Ridge Parkway - Frying Pan Mountain04/01/200310/31/2008
Blue Ridge Parkway - Ranger Station04/01/200312/31/2008
Blue Ridge Parkway - Route 19104/01/200310/31/2008
Blue Ridge Parkway - Vinton Elementary01/01/200312/31/2008
Boston Harbor Islands National Recreation Area - Former Nike Missle Site01/01/200312/31/2008
Canyonlands National Park - Island in the Sky07/01/199205/18/2019
Cape Cod National Seashore04/01/198712/31/2017
Carl Sandburg National Historic Park - Pasture04/05/201211/01/2012
Carlsbad Caverns National Park - Maintenance Area06/15/200611/09/2018
Chaco Culture National Historical Park - Radio Repeater11/16/201605/18/2019
Chamizal National Memorial04/01/198812/31/2017
Chickamauga/Chattanooga National Military Park - Lookout Mountain04/07/201011/02/2016
Chiricahua National Monument - Entrance Station01/01/199005/18/2019
City of Rocks National Reserve - Juniper Campground03/24/201009/26/2011
Colorado National Monument - Maintenance Yard05/01/200604/02/2013
Congaree National Park - Congaree Bluff01/20/200012/31/2017
Cowpens National Battlefield - State Monitor04/01/198801/26/2016
Craters of the Moon National Monument - Visitor Center09/24/199205/18/2019
Cumberland Gap National Historic Park - Hensley Settlement04/26/200610/03/2014
Cuyahoga Valley National Park - 800 Patterson04/01/200310/31/2008
Death Valley National Park - Park Village12/01/199305/18/2019
Denali National Park - Headquarters07/01/198705/18/2019
Dinosaur National Monument - West Entrance Housing04/30/200505/18/2019
Escalante National Monument - Visitor Center12/15/201101/04/2016
Everglades - Cutler Road01/01/200312/31/2017
Everglades National Park - Beard Center09/01/198205/18/2019
Fort Laramie National Historic Site - North Boundary05/14/201409/28/2016
George Washington Pkwy - Alexandria Health01/01/200312/31/2008
Glacier National Park - Saint Mary's Ranger District05/05/200909/29/2010
Glacier National Park - West Glacier Horse Stables01/01/199205/18/2019
Grand Canyon National Park - The Abyss01/01/199305/18/2019
Grand Teton National Park - Science School08/22/201105/18/2019
Great Basin National Park - Maintenance Yard08/24/199305/18/2019
Great Smoky Mountains National Park - Cades Cove07/01/199305/18/2019
Great Smoky Mountains National Park - Clingmans Dome10/02/199205/18/2019
Great Smoky Mountains National Park - Cove Mountain07/01/198805/18/2019
Great Smoky Mountains National Park - Look Rock07/01/198805/18/2019
Great Smoky Mountains National Park - Look Rock NCORE 12/31/201305/18/2019
Great Smoky Mountains National Park - Purchase Knob06/06/199511/01/2017
Guilford Courthouse National Military Park - Library04/06/201212/04/2012
Guilford Courthouse National Military Park - Mendenhall Middle School01/01/200312/31/2008
Gulf Islands National Seashore - Fort Pickens Entrance Stn.08/07/200411/02/2005
Hawaii Volcanoes National Park - Chain of Craters 12/06/201005/18/2019
Hawaii Volcanoes National Park - Devastation 12/07/201005/18/2019
Hawaii Volcanoes National Park - Keala Komo 203/19/201009/29/2010
Hawaii Volcanoes National Park - Namakanipaio Campground02/23/201105/18/2019
Hawaii Volcanoes National Park - Naulu12/06/201005/08/2019
Hawaii Volcanoes National Park - Observatory / Jaggar Museum09/15/199907/03/2018
Hawaii Volcanoes National Park - Parking Lot 12/08/201005/18/2019
Hawaii Volcanoes National Park - Steam Vents 12/06/201005/18/2019
Hawaii Volcanoes National Park - Thurston12/08/201005/18/2019
Hawaii Volcanoes National Park - Visitor Center10/01/198605/18/2019
Indiana Dunes National Lakeshore - Ammunition Bunker01/01/200312/31/2017
Indiana Dunes National Lakeshore - Gas Station01/01/200312/31/2008
Indiana Dunes National Lakeshore - Water Treatment Plant01/03/200312/29/2008
Joshua Tree - Cottonwood Visitor Center01/30/201805/18/2019
Joshua Tree National Park - Black Rock09/01/199305/18/2019
Joshua Tree National Park - Cottonwood Canyon12/14/200501/31/2018
Joshua Tree National Park - Pinto Wells11/03/200305/18/2019
Kings Mountain National Military Park - Brown's Mountain01/06/201111/16/2015
Kings Mountain National Military Park - RAWS Station04/15/201602/02/2017
Kings Mountain National Military Park - Reservoir Hill05/26/200501/07/2011
Lake Mead National Recreation Area - Meadview05/22/200310/02/2006
Lassen Volcanic National Park - Manzanita Lake Fire Stn.10/01/198705/18/2019
Little River Canyon National Reserve - Canyon High07/13/200410/31/2011
Lyndon B. Johnson National Historic Park - Hay Barn03/29/201110/01/2011
Mammoth Cave National Park - Great Onyx Job Corps09/14/200510/26/2005
Mammoth Cave National Park - Houchin Meadow07/23/199705/18/2019
Meeker - Plant Science01/08/201005/18/2019
Mesa Verde National Park - Resource Mngment Area03/01/199305/18/2019
Minidoka National Historic Site - Maintenance Building11/09/201505/18/2019
Mississippi National Recreation Area - Anoka County Airport01/23/200312/31/2008
Mississippi National Recreation Area - Somerset Town Hall01/01/200312/31/2008
Mojave National Preserve - Kelso Mountains05/09/200705/18/2019
Mount Baker06/14/200710/06/2008
Mount Rainier National Park - Tahoma Woods07/01/199110/01/2013
Mount Ranier National Park - White River06/27/200610/14/2006
Natchez Trace - Buzzard Roost Springs05/06/200909/30/2009
Natchez Trace Parkway - Dancy Ranger Station04/11/200609/26/2008
North Cascades National Park - Marblemount Ranger Stn.02/14/199601/01/2008
Olympic National Park - Deer Park06/18/200910/06/2011
Olympic National Park - Hurricane Ridge Portable05/26/200409/30/2008
Padre Island National Seashore - Malaquite Visitor Center05/01/200507/21/2008
Petrified Forest National Park - South Entrance09/18/200205/18/2019
Petroglyph - Westside Taylor Ranch01/01/200312/31/2008
Pinnacles National Park - SW of East Entrance Stn.04/01/198705/18/2019
Rangely - Golf Course08/06/201005/18/2019
Rock Creek - Achbold Parkway01/01/200312/31/2008
Rocky Mountain National Park - Trail Ridge 12/30/199909/18/2014
Rocky Mountain National Park - Beaver Meadows06/24/200910/14/2010
Rocky Mountain National Park - Long's Peak04/01/198705/18/2019
Rocky Mountain National Park - Long's Peak Portable07/12/200210/31/2005
Rocky Mountain National Park - West Entrance07/01/201010/13/2010
Russell Cave National Monument - Visitor Center08/18/200411/02/2011
Saguaro National Park - East01/01/199212/31/2017
Saratoga National Historical Park - Stillwater01/01/200312/31/2008
Saugus Iron Works National Historic Site - Lynn Water Treatment01/01/200312/31/2008
Scotts Bluff National Monument - Visitor Center04/29/201010/01/2012
Sequoia and Kings Canyon National Parks - Ash Mountain07/01/199905/18/2019
Sequoia and Kings Canyon National Parks - Lower Kaweah06/01/198405/18/2019
Shenandoah National Park - Big Meadows05/01/198305/18/2019
Stones River National Battlefield - Beasley Field08/18/200111/02/2016
Theodore Roosevelt National Park - Painted Cany. VC07/27/199805/18/2019
Voyageurs National Park - Sullivan Bay06/12/199605/18/2019
Walden - Colorado - Chandler Ranch10/11/201101/04/2016
Wind Cave National Park - Visitor Center11/21/200305/18/2019
Yellowstone National Park - Old Faithful12/17/200205/08/2012
Yellowstone National Park - Old Faithful Snow Lodge10/18/201205/18/2019
Yellowstone National Park - Old Faithful Visitor Center11/10/201105/10/2012
Yellowstone National Park - Water Tank06/26/199605/18/2019
Yellowstone National Park - West Entrance07/17/200805/18/2019
Yellowstone National Park - West Entrance State Site12/01/200208/18/2010
Yosemite - Mobile - Glacier Point06/22/200610/01/2012
Yosemite National Park - Merced River07/31/200201/02/2006
Yosemite National Park - Mobile03/13/200707/10/2008
Yosemite National Park - Mobile - 2 (Lake Tenaya)06/28/200710/02/2007
Yosemite National Park - School Yard06/06/200601/07/2014
Yosemite National Park - Turtleback Dome01/01/199205/18/2019
Yosemite National Park - Turtleback Dome Co-located04/19/201205/07/2013
Yosemite National Park - Village01/01/200512/31/2012
Zion National Park - Dalton's Wash01/12/200405/18/2019