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 Hill02/09/199812/08/2024
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 Center10/01/198712/31/2023
Big Bend National Park - K-Bar Ranch Road09/15/199012/08/2024
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 Sky07/01/199212/08/2024
Cape Cod National Seashore04/01/198706/30/2024
Carl Sandburg National Historic Park - Pasture04/05/201211/01/2012
Carlsbad Caverns National Park - Biology Building07/10/201912/08/2024
Carlsbad Caverns National Park - Maintenance Area06/15/200611/09/2018
Chaco Culture National Historical Park - Radio Repeater02/23/201712/08/2024
Chamizal National Memorial04/01/198812/31/2023
Chickamauga/Chattanooga National Military Park - Lookout Mountain04/07/201011/02/2016
Chiricahua National Monument - Entrance Station01/01/199012/08/2024
City of Rocks National Reserve - Juniper Campground03/24/201009/26/2011
Colorado National Monument - Maintenance Yard05/01/200604/02/2013
Congaree National Park - Congaree Bluff01/20/200011/03/2023
Cowpens National Battlefield - State Monitor04/01/198801/26/2016
Craters of the Moon National Monument - Visitor Center09/24/199212/08/2024
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 Village12/01/199312/08/2024
Denali National Park - Headquarters07/01/198712/08/2024
Dinosaur National Monument - West Entrance Housing04/30/200512/08/2024
Escalante National Monument - Visitor Center12/15/201101/04/2016
Everglades - Cutler Road01/01/200312/31/2023
Everglades National Park - Beard Center09/01/198212/08/2024
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 Stables01/01/199212/08/2024
Grand Canyon - Portable06/14/201902/20/2020
Grand Canyon National Park - Mather Point Bench02/20/202012/08/2024
Grand Canyon National Park - The Abyss01/01/199312/08/2024
Grand Teton National Park - Science School08/22/201112/08/2024
Great Basin National Park - Maintenance Yard08/24/199312/08/2024
Great Smoky Mountains National Park - Cades Cove07/01/199312/08/2024
Great Smoky Mountains National Park - Cove Mountain07/01/198812/08/2024
Great Smoky Mountains National Park - Kuwohi (Clingmans Dome)10/02/199210/30/2024
Great Smoky Mountains National Park - Look Rock07/01/198812/08/2024
Great Smoky Mountains National Park - Look Rock NCORE 12/31/201312/08/2024
Great Smoky Mountains National Park - Purchase Knob06/06/199511/01/2023
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 12/06/201008/25/2024
Hawaii Volcanoes National Park - Devastation 12/07/201008/18/2024
Hawaii Volcanoes National Park - Kahuku - Cross Fence06/22/201812/08/2024
Hawaii Volcanoes National Park - Kahuku - Facilities09/05/201811/18/2024
Hawaii Volcanoes National Park - Keala Komo 203/19/201009/29/2010
Hawaii Volcanoes National Park - Namakanipaio Campground02/23/201112/08/2024
Hawaii Volcanoes National Park - Naulu12/06/201011/18/2024
Hawaii Volcanoes National Park - Observatory / Jaggar Museum09/15/199912/08/2024
Hawaii Volcanoes National Park - Parking Lot 12/08/201012/08/2024
Hawaii Volcanoes National Park - Steam Vents 12/06/201012/07/2024
Hawaii Volcanoes National Park - Thurston12/08/201012/08/2024
Hawaii Volcanoes National Park - Visitor Center10/01/198612/08/2024
Indiana Dunes National Lakeshore - Ammunition Bunker01/01/200312/31/2023
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 Rock09/01/199312/08/2024
Joshua Tree National Park - Cottonwood Canyon12/15/200501/31/2018
Joshua Tree National Park - Cottonwood Visitor Center01/30/201812/08/2024
Joshua Tree National Park - Pinto Wells11/03/200312/08/2024
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.10/01/198712/08/2024
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 Meadow07/23/199712/08/2024
Meeker - Plant Science01/08/201006/17/2019
Mesa Verde National Park - Resource Management Area03/01/199312/08/2024
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.04/01/198712/08/2024
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 Peak04/01/198712/08/2024
Rocky Mountain National Park - West Entrance07/01/201010/13/2010
Russell Cave National Monument - Visitor Center08/18/200411/02/2011
Saguaro National Park - East01/01/199212/31/2023
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 Mountain07/01/199912/08/2024
Sequoia and Kings Canyon National Parks - Lower Kaweah06/01/198411/07/2024
Shenandoah National Park - Big Meadows05/01/198312/08/2024
Skagway - Alaska State - 2B AQLite 1011 and Modulair 116401/31/202412/08/2024
Skagway - Cedar House - 2B PAM 128901/31/202412/08/2024
Skagway - Duplex Dorm - 2B PAM 128801/31/202412/07/2024
Skagway - Maintenance Yard - 2B PAMS 128602/01/202412/08/2024
Skagway - STC Farm - 2B PAM01/31/202412/08/2024
Skagway - Soapy's - Jeff. Smiths Parlor Museum - Soapy's - PAM128701/31/202412/08/2024
Skagway - Tribal Community Center - AQSync01/30/202412/08/2024
Skagway - Water Department - 2B AQLite 1527 and Modulair 116501/31/202412/08/2024
Stones River National Battlefield - Beasley Field08/18/200111/02/2016
Theodore Roosevelt National Park - Painted Cany. VC07/27/199812/08/2024
Voyageurs National Park - Sullivan Bay06/12/199612/08/2024
Walden - Colorado - Chandler Ranch10/11/201101/04/2016
Wind Cave National Park - Visitor Center11/21/200312/31/2023
Yellowstone National Park - Old Faithful12/17/200205/08/2012
Yellowstone National Park - Old Faithful Snow Lodge10/18/201212/08/2024
Yellowstone National Park - Old Faithful Visitor Center11/10/201105/10/2012
Yellowstone National Park - Water Tank06/26/199612/08/2024
Yellowstone National Park - West Entrance07/17/200812/08/2024
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 Dome01/01/199212/08/2024
Yosemite National Park - Turtleback Dome Co-located04/19/201205/07/2013
Yosemite National Park - Yosemite Village01/01/200512/31/2023
Zion National Park - Dalton's Wash01/12/200412/08/2024
 01/08/201912/31/2023