The 14th annual Tillamook Bay Run starts 10 AM, Saturday, August 15. Both the 10k and 5k routes begin on the ocean side of Bayocean Spit and cross over to return on the bay side. With both gravel and sand to contend with, rugged shoes are a must. For more information and/or to register go to http://bayrun.org. If you were looking for a nice, quiet day on the spit, you might want to choose a different one.
Update: unfortunately I've not been able to find results or an event report anywhere online. What's posted at the organization's web site is for the previous year, so take a look in 11 months.