The downhill Tunnel Light Marathon course is very fast. However, running just over two miles through a tunnel and the trail surface (hard-packed gravel) may slow some runners.
From race website - The course starts at Hyak, 50 miles east of Seattle Washington, and runs down to North Bend on gravel rail-trails. It is a Boston qualifier and has the best profile in the country for a fast time due to the consistent gentle downhill grade and the low starting elevation. The first three miles are flat, cold, foggy and damp inside an unlit tunnel. Flashlights are strongly recommended. Once out of the Tunnel the gravel trail starts down the hill and keeps on going down, 2050 feet in the next 23 miles. It's never steep enough to be uncomfortable; you just feel like you're having a good day.
The Tunnel Light Marathon was the 142nd largest marathon in the U.S. last year and was the 154th largest in 2015.
Last year 34.3% of finishers qualified for the Boston Marathon and 32.1% of runners qualified for Boston in 2015.
This gives the Tunnel Light Marathon the 6th highest percentage of Boston Marathon qualifiers in the U.S. last year and the 5th highest percentage in 2015.
Its Course Score of 104.37 ranks it as the 9th fastest marathon course in the U.S. and the 4th fastest course in Washington.
The typical race time temperature and humidity levels are above the ideal range for optimal marathon performance. This, coupled with the Course Score, gives the Tunnel Light Marathon a PR Score of 102.88. This PR Score ranks it as the 10th fastest marathon in the U.S. and the 4th fastest in Washington.
Learn more about PR Scores and Course Scores on the FAQ page.