Arch Wooden Bridge

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I am building an arch wooden bridge or #2 Douglas Fir. I have doweled and Glued two 2x10's to create a 2x20. I have an 11' span, with a total length of 13'.I will have a 9-1/2" arch in the bridge. What will the be the maxium bearing load I can put on this bridge. There will be a 32" spacing between the two beams, with 4 diaphrams between them.