While admittedly a bit contrived, this route links up the majority of the best gravel in the area, combining lots-o-climbing, stellar views and some really cool, remote hardpack on Hastings Ridge.
I’d skip Hastings Road when there’s any chance of mud – it’s likely impassable by skinny-tired bikes when wet.   Use the map referenced below for alternates – everything in the area is primo riding.
For those who get crushed by the route there’s the defeated King Harold finish which takes a flatter, paved route back to the Dalles.   This option skips about 600 ft. of climbing and a bunch more gravel.

DETAILS:

Terms of Use: As with each adventure route guide published on OMTM.CC, should you choose to cycle this route, do so at your own risk. Prior to setting out check current local weather, conditions, and land/road closures. While riding, obey all public and private land use restrictions and rules, carry proper safety and navigational equipment, and of course, follow the #leavenotrace guidelines. The information found herein is simply a planning resource to be used as a point of inspiration in conjunction with your own due-diligence. In spite of the fact that this route, associated GPS track (GPX and maps), and all route guidelines were prepared under diligent research by the specified contributor and/or contributors, the accuracy of such and judgement of the author is not guaranteed. OMTM.CC, its partners, associates, and contributors are in no way liable for personal injury, damage to personal property, or any other such situation that might happen to individual riders cycling or following this route.