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 Hill02/09/199807/12/2024
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 Center10/01/198706/30/2023
Big Bend National Park - K-Bar Ranch Road09/15/199007/12/2024
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 Sky07/01/199207/12/2024
Cape Cod National Seashore04/01/198712/31/2022
Carl Sandburg National Historic Park - Pasture04/05/201211/01/2012
Carlsbad Caverns National Park - Biology Building07/10/201907/12/2024
Carlsbad Caverns National Park - Maintenance Area06/15/200611/09/2018
Chaco Culture National Historical Park - Radio Repeater02/23/201707/12/2024
Chamizal National Memorial04/01/198812/31/2022
Chickamauga/Chattanooga National Military Park - Lookout Mountain04/07/201011/02/2016
Chiricahua National Monument - Entrance Station01/01/199007/12/2024
City of Rocks National Reserve - Juniper Campground03/24/201009/26/2011
Colorado National Monument - Maintenance Yard05/01/200604/02/2013
Congaree National Park - Congaree Bluff01/20/200011/02/2022
Cowpens National Battlefield - State Monitor04/01/198801/26/2016
Craters of the Moon National Monument - Visitor Center09/24/199207/11/2024
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 Village12/01/199307/12/2024
Denali National Park - Headquarters07/01/198707/12/2024
Dinosaur National Monument - West Entrance Housing04/30/200507/12/2024
Escalante National Monument - Visitor Center12/15/201101/04/2016
Everglades - Cutler Road01/01/200312/31/2022
Everglades National Park - Beard Center09/01/198207/12/2024
Fort Laramie National Historic Site - North Boundary05/14/201409/28/2016
George Washington Pkwy - Alexandria Health01/01/200312/31/2008
Glacier National Park - St. Mary - Visitor Center05/05/200909/29/2010
Glacier National Park - West Glacier Horse Stables01/01/199207/12/2024
Grand Canyon - Portable06/14/201902/20/2020
Grand Canyon National Park - Mather Point Bench02/20/202007/12/2024
Grand Canyon National Park - The Abyss01/01/199307/12/2024
Grand Teton National Park - Science School08/22/201107/12/2024
Great Basin National Park - Maintenance Yard08/24/199307/12/2024
Great Smoky Mountains National Park - Cades Cove07/01/199307/12/2024
Great Smoky Mountains National Park - Clingmans Dome10/02/199207/12/2024
Great Smoky Mountains National Park - Cove Mountain07/01/198807/12/2024
Great Smoky Mountains National Park - Look Rock07/01/198807/12/2024
Great Smoky Mountains National Park - Look Rock NCORE 12/31/201307/12/2024
Great Smoky Mountains National Park - Purchase Knob06/06/199511/01/2022
Guadalupe Mountains National Park - Maintenance Area07/18/201907/31/2022
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.08/08/200411/02/2005
Hawaii Volcanoes National Park - Chain of Craters 12/06/201007/12/2024
Hawaii Volcanoes National Park - Devastation 12/07/201007/12/2024
Hawaii Volcanoes National Park - Kahuku - Cross Fence06/22/201807/12/2024
Hawaii Volcanoes National Park - Kahuku - Facilities09/05/201806/15/2024
Hawaii Volcanoes National Park - Keala Komo 203/19/201009/29/2010
Hawaii Volcanoes National Park - Namakanipaio Campground02/23/201105/31/2024
Hawaii Volcanoes National Park - Naulu12/06/201007/12/2024
Hawaii Volcanoes National Park - Observatory / Jaggar Museum09/15/199907/12/2024
Hawaii Volcanoes National Park - Parking Lot 12/08/201007/12/2024
Hawaii Volcanoes National Park - Steam Vents 12/06/201007/09/2024
Hawaii Volcanoes National Park - Thurston12/08/201007/12/2024
Hawaii Volcanoes National Park - Visitor Center10/01/198607/12/2024
Indiana Dunes National Lakeshore - Ammunition Bunker01/01/200312/31/2022
Indiana Dunes National Lakeshore - Gas Station01/01/200312/31/2008
Indiana Dunes National Lakeshore - Water Treatment Plant01/03/200312/31/2019
Joshua Tree National Park - Black Rock09/01/199307/12/2024
Joshua Tree National Park - Cottonwood Canyon12/15/200501/31/2018
Joshua Tree National Park - Cottonwood Visitor Center01/30/201807/12/2024
Joshua Tree National Park - Pinto Wells11/03/200307/12/2024
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.10/01/198707/12/2024
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 Meadow07/23/199707/12/2024
Meeker - Plant Science01/08/201006/17/2019
Mesa Verde National Park - Resource Management Area03/01/199307/12/2024
Minidoka National Historic Site - Maintenance Building11/09/201508/03/2020
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 Mountains05/09/200711/03/2020
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 Entrance09/18/200201/02/2024
Petroglyph - Westside Taylor Ranch01/01/200312/31/2008
Piceance - Mountain Top03/17/201511/01/2023
Pinnacles National Park - SW of East Entrance Stn.04/01/198707/12/2024
Rangely - Golf Course08/06/201011/02/2023
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 Peak Portable07/12/200210/31/2005
Rocky Mountain National Park - Longs Peak04/01/198707/12/2024
Rocky Mountain National Park - West Entrance07/01/201010/13/2010
Russell Cave National Monument - Visitor Center08/18/200411/02/2011
Saguaro National Park - East01/01/199212/31/2022
Saratoga National Historical Park - Stillwater01/01/200311/30/2019
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 Mountain07/01/199907/12/2024
Sequoia and Kings Canyon National Parks - Lower Kaweah06/01/198407/12/2024
Shenandoah National Park - Big Meadows05/01/198307/12/2024
Stones River National Battlefield - Beasley Field08/18/200111/02/2016
Theodore Roosevelt National Park - Painted Cany. VC07/27/199807/12/2024
Voyageurs National Park - Sullivan Bay06/12/199607/12/2024
Walden - Colorado - Chandler Ranch10/11/201101/04/2016
Wind Cave National Park - Visitor Center11/21/200301/16/2023
Yellowstone National Park - Old Faithful12/17/200205/08/2012
Yellowstone National Park - Old Faithful Snow Lodge10/18/201207/12/2024
Yellowstone National Park - Old Faithful Visitor Center11/10/201105/10/2012
Yellowstone National Park - Water Tank06/26/199607/12/2024
Yellowstone National Park - West Entrance07/17/200807/12/2024
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 Dome01/01/199207/12/2024
Yosemite National Park - Turtleback Dome Co-located04/19/201205/07/2013
Yosemite National Park - Yosemite Village01/01/200512/31/2022
Zion National Park - Dalton's Wash01/12/200407/12/2024