What is too messy for a Trail Run?

I've only done a few trail runs and from my experience the crazy sadists who are trail runners think mud is the greatest thing ever.  They are an odd bunch, but fun to race with!  I would run as fast as you feel comfortable running.  It's just like any other training obstacle like heat while running or fast descents on the bike.  You have to feel comfortable with what you are doing and be responsible for your own safety.

Thanks for the replies.

1.  I thought about the damage to the trail and contacted the race folks to see if they wanted to organize a trail day to go and repair some of the damage that was done.

2.  As far as the distance, that's one of the downsides to the Garmin, it's not real accurate on trail runs/rides.  There were many switch backs, some fairly dense tree coverage and such.  It does tend to read lower, that's why I'm think it's closer to 4 miles.

3.  These races are a tempo/hill workout for me in training for my Half Marathon.  Something different than the same old running and it's only once a month.  My main focus is to have fun and stay healthy so I was very cautious in this race.  Enough so, that my one training partner, who I normally finish a couple minutes in front of, actually finished in front of me by a couple of minutes.

I did an Xterra trail half Mary earlier this year and it rained several inches over nite and thru out the race. It was alot of fun and added to the Xterra feel of the race. It was one long slippery sliding hilly mud puddle race. I was at least 5 minutes slower than compared to a dry day but so was everyone else. Thats not too dangerous you just have go with flow and slow down if needed.