All the positives of this run (scenic course, nice goody bag, great volunteers) were negated when aid stations ran out of water after the 22 mile mark on a 85 degree day. If the race organizers are serious about thanking participants for running this charity event, they have to show more regard for the health and well-being of marathoners IMO. And be cognizant of the comments made regarding the course being long- I noticed many runners failing to run the tangents properly who undoubtedly ran longer than 26.2. Otherwise, this is a friendly small town marathon in a beautiful setting.

I really like the Diamond Valley Lake marathon. Small, low key, scenic. And they have race day registration!

This was the fifth time I've done this race and it was well worth it. My fault for not checking the start time so I got there at 6:15 for an 8 AM race. Shuttle up the hill was new this year, nice to have the option of parking at the aquatics center and not paying $7 to enter the lot. Restroom trailer in the parking lot was also a great improvement over the portapotties!

Nice to have the race personnel out there listening to feedback and answering questions. Lots of volunteers. Aid stations were well stocked  thank you for having Gatorade rather than Heed!  and plentiful enough. Weather was perfect.

I fell at mile 3, but that's not the race's fault, it is a rocky fire road.

Think the mile 6 marker should have been mile 5, I was not going as fast as that indicated. Subsequent mile markers also didn't seem correctly placed. The mileposts installed by the water district around the lake are more useful.

And we saw a bald eagle fly 30 feet in front of us while crossing the third dam! How cool is that?

Not for those who think that racing involves lots of spectators, live bands, a flashy expo and medal and fancy shirt, and lots of free food afterwards; however, if you are more interested in the run itself than its accessories, check out this event.

I really enjoyed this race. One thing I would like to see is more runners and the time to start at least one hour eariler. Love the busses and volunteer. One thing I found is kids were playing in the way as the runner were coming in, and my times was not posted.. I will be there niext year. Thank you.

This is a small, friendly, no frills race run on mostly dirt. The course is mostly rolling terrain with some serious hills. Don't expect all the bells and whistles of a race run by a sports promoter. The Race is run by non professionals raising money for a good cause. Arrive early since there is a traffic backed up at the lake entrance where you pay a $5 parking fee or you can park for free and take a shuttle to the start. This is a good race for the average runner to place in his/her age group.

Really enjoyed running with a smaller group as opposed to the Long Beach Marathon. Incredible views and much solitude. Will be back with a doubt.

This was an awesome, down home, organic type of race. Super small, but the course was great trail, rolling hills, pretty views. Weather was perfect, support every couple miles with port-potties. They were off on their mile markers for a while, but it didn't matter. For a rolling, charming trail run, this is the one of the best.

First time running this course. Its beautiful and the weather was perfect. Mostly dirt roads and a few paved sections. If you only care about the course then this is the marathon for you. The aide stations were poorly manned and there was a lot of confusion at the beginning of this race. Bib distribution was unorganized and little priority was given to marathoners who were running well before anyone else. The finish was not much better. I paid $70 dollars to run this race and my time was not even recorded!!!!

This marathon should attract more runners to a uniquely beautiful course with a few administrative improvements and more awareness. Where can you run around a lake for 26 miles on mostly dirt roads? If you like the tranquility of a rural setting with virtually no spectators and supportive volunteers at the aid stations, then this marathon is a must for more southern California runners. The schedule change from January to April should improve the odds for favorable weather. This year was perfect running weather in the 50's. The bib pick-up, award distribution and results posting need some attention. This marathon is for the pure enjoyment of running without huge crowds and the need for an expo.

Very well stated by TL; I agree with everything. I would add that I am disappointed that I did complete the race and it was not reported to Marathon Guide... it's almost like I didn't officially finish. Maybe the nature of the weather and the course necessitated that management exclude official results, or results beyond a certain finish time.

If you finished Diamond Valley Lake 2010, you are BADASS. Race was postponed two weeks due to inclement weather, and the weather was no better February 6 than it was January 23. Sleet, hail, sideways rain, muddy trails, and gusty winds. However, to counteract that, we had rainbows, sunny intervals, no danger of overheating, and little streams along and across the trail.

Race had 60 starters, and I'm not sure how many finishers. I was advised at mile 15 that the race was being canceled due to inclement weather, but told that I could keep running until they came by with a vehicle to pick up the runners, and I managed to make it all the way around the course without being pulled off. Glad they decided that most experienced entrants are capable of deciding when they need to pack it in and let us continue to finish the course. We weren't expecting a walk in the park.

The course is quiet, secluded, undulating, and wild. It's great if you are self-sufficient and you can deal with having very few spectators and no bands or other distractions.

The race is well organized, the volunteers are top notch, and the runners are a good bunch. I recommend this race to serious runners and those who want a long rural run within easy driving distance of metro Los Angeles. If you're not comfortable with your own company, go run something else. But if you love running for running's sake, do this race.