I Had a recent car accident which I believe I was not at fault, need some help.....?

I was recently driving home on the highway and there was something in the middle of my lane, looked like a ladder or something of that nature. I didnt have time to swerve into the other lane because it would of been unsafe and was boxed in. I hit the object and spun out of control causing me to do a 360 in the middle of the highway. The only damage I had was to the front bumper from the original impact, no other cars hit me and i avoided the median. I'm I at fault wit my insurance company since I was the only car involved? can I sue the highway department for not keeping the lanes cleared? the damage is approx. 1300 and my deductible is 1000, should i claim it? I filed a police report, are they going to release that to my insurance if i dont claim the accident?