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Discussion Starter · #1 ·
Hi all: I've looked at blueprints on the IMBA website and USFS for that matter, and everywhere else Google would take me, and don't find anything pre-engineered I can use. I am confident I could design and build a durable bridge myself, but a pre-engineered structure would be a big help with the permitting agencies I'll have to deal with (state parks and potentially a city building dept.) in developing a couple new trails. Any help or direction would be appreciated.
 

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Discussion Starter · #3 ·
thanks, already found most of these

What we think will help with the permitting authorities is pre-engineered 2X or 4X bridges we can build ourselves; it's the "official" drawings I need for the reviewing authorities to look at and feel comfortable that we know what we're doing.
 

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TFitz said:
Hi all: I've looked at blueprints on the IMBA website and USFS for that matter, and everywhere else Google would take me, and don't find anything pre-engineered I can use. I am confident I could design and build a durable bridge myself, but a pre-engineered structure would be a big help with the permitting agencies I'll have to deal with (state parks and potentially a city building dept.) in developing a couple new trails. Any help or direction would be appreciated.
Seems like a 25" bridge would not need much pre-engineering.
 

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Builder of Trails
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TFitz said:
Hi all: I've looked at blueprints on the IMBA website and USFS for that matter, and everywhere else Google would take me, and don't find anything pre-engineered I can use. I am confident I could design and build a durable bridge myself, but a pre-engineered structure would be a big help with the permitting agencies I'll have to deal with (state parks and potentially a city building dept.) in developing a couple new trails. Any help or direction would be appreciated.
Email me. I have a .pdf document that I think will help you titled "Standard Details of Pre-engineered Bridges for Mountain Bike Trails."

D
 

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Discussion Starter · #9 ·
Thanks for the responses. I've looked at the IMBA doc, and the trouble is it stops just short of the longer span I need for the two stream crossings required. I looked at the Rainbow website, and we need something a little beefier; both for load and weather durability. I'll look at the USFS drawings shortly. Again, the issue is more credibility with the reviewing agencies than our ability to actually design and build the bridges.
 

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Discussion Starter · #13 ·
Again, thanks for all the responses, esp. Radair. This will be a trail for both bikers and hikers, so I don't feel comfortable asking people on foot to jump a 20+ foot gap. :) Also, the land managers want the stream crossings, seasonal tho' they are, protected, so a ford is no go. We still may be a few seasons away from getting the bureaucratic hurdles jumped, but I'll post project pics when we're done.
 

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Oh come on the hikers can run and jump it............

Here's a show off shot of a new gap stepdown (21' tip to tip but we usually end up about 24-25'0I built on a B line of "my trail," 45 stunts and maybe more in a 1 1/2 miles of trail.
 

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TFitz said:
Hi all: I've looked at blueprints on the IMBA website and USFS for that matter, and everywhere else Google would take me, and don't find anything pre-engineered I can use. I am confident I could design and build a durable bridge myself, but a pre-engineered structure would be a big help with the permitting agencies I'll have to deal with (state parks and potentially a city building dept.) in developing a couple new trails. Any help or direction would be appreciated.
I don't know what your budget is like, but there are several good manufacturers of pre-engineered bridges that are delivered ready to assemble.

I have had 7 installed in the past 14 months that range from 20' to 80', and all of them came ready to assemble with small crews, and came with the certified structural engineers drawings and calculations that met all permitting requirements.

You can order them for various purposes that meet all local codes pertaining to railing systems. The ones I ordered were intentionally over-built to handle anything up to a 5,000 lb maintenance vehicle that could fit within the 60" width....which allows me to get my small excavator, over the bridge.

The ones I have used in the past have been from Western Wood Structures, and Wheeler Bridges.

The nice part about bridges like these is that your pretty much can't be questioned or challenged on the bridge, so you have a pretty good legal buffer.

Hope this helps!

Photos of a 40' and 60' bridge installed over the past 6 months.
 

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