I read the following update in the Portland Wheelmen Touring Club newsletter: " I contacted Mike Green, the construction manager of the Gresham-Fairview Trail in order to express concerns about the pavers.... they will be improving this condition when the rainy season ends. They will be filling the spaces between tiles with mortar.... If this is not successful they are considering paving over them." To see the entire article you'll have to get a copy of the PWTC bulletin, unfortunately it is not available on line. Club members are mailed the bulletin monthly, perhaps a good reason to join a local club.