Well I used the fisheries managers method, and actually estimated it larger than 70'". Did it again twice, and depending on how stedy I was, I came up with at least 70". The 2x4 in the back is layed on it's face under the shelf. A standard 2x4 measures an actual 31/2" on its face. I marked that measurement on transparent paper and counted 22 increments the first time and 21 twice after that, so do the math.............. I don't know, I do know thats one BIG pike!