The 2020 GAP Trestles Marathon and Half Marathon was cancelled due to COVID-19. There will not be an Altis race series in 2021. The plan to conduct the seventh edition of this race is unknown as of January 2022.
Both the marathon and half marathon start at 8:00AM. This event will take place in its entirety in Pennsylvania on the outstanding Great Allegheny Passage. Runners will cross three trestles on the course – to include the 1908 foot long Salisbury Viaduct (pictured above) over the Casselman River Valley, the 910 foot long Keystone Viaduct, and the historic Wills Creek Bollman Truss Bridge. The race start/finish is on the Great Allegheny Passage near the Western Maryland Railway Station at 529 Main Street Meyersdale, PA 15552.
This race will be the third event in the 2022 Mid-Atlantic Marathon and Half Marathon Series taking place from September 28-October 2. The other events in the Series are the GAP Marathon and Half, the inaugural Eastern Continental Divide Marathon and Half, the Salisbury Viaduct Marathon and Half, and the Hancock Marathon and Half. In order, the series races take place in MD, PA, PA, PA, and MD. Run one, some, or all these great trail races!
“This is a wonderful series of friendly races with tremendous organization in beautiful locations that runners need to experience.”
Steve Hughes,
Marathon Maniacs Hall of Fame
The race start/finish is on the Great Allegheny Passage near the Western Maryland Railway Station at 529 Main Street Meyersdale, PA 15552.
Use 
Runners start on the Great Allegheny Passage at the Western Maryland Railway Station and head northwest on the trail. After crossing the Salisbury Viaduct runners turn around and head southeast on the trail for 6.56 miles to the southeast turnaround between Miller Run Road and Warrens Mill Road. At the southeast turnaround runners turn around again and head northwest on the trail back to the start/finish. The Half Marathon runners will finish their race upon reaching the start/finish at the Railway Station. Marathon runners will do another loop of the course to complete the marathon. Half marathon entrants will cross each trestle twice while the marathon runners will cross each trestle four times. The trail surface is a fantastic crushed stone surface which is great for running. The course map link below also shows the elevation profile of the course. The course is not flat, but the elevation change is gradual. The half marathon has about 1166 feet of gain and loss, and the marathon runners will experience about 2332 feet of gain and loss on the course.
The course map can be viewed at 
The design image for the 2020 GAP Trestles Marathon and Half Marathon finisher award is pictured above. Great thanks to super runner Markus Mueller for designing the race finisher award!
Historical average high and low temperatures in Meyersdale, PA on October 9th are 62 and 42 degrees.