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Thread: A Solution for Trollheim

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    Default A Solution for Trollheim

    While on vacation at Chincoteague, VA, I traveled on a possible solution for our own diabolically slippery-when-wet Trollheim (the sheltered boardwalk between TR Island and Memorial Bridge on the Mt. Vernon Trail). I had long wondered about a concrete (pun intended) solution to this segment after observing how wooden railroad ties are being replaced with cast concrete ties. So...Click image for larger version. 

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    behold a stretch of "boardwalk" over salt marsh grass, part of the bike path and road over the channel to Assateague Island National Seashore. The planks are wider, true, but they got the color right, and there *is* a wood texture courtesy of the boards used as a mold, all to emulate wood. It has a grippy texture and looks to be safe to ride when wet.

    Now if the National Park Service says, "It can't be done", you can point and say, "You already have!"
    Last edited by Starduster; 07-22-2018 at 02:16 PM. Reason: I correct my spelling errors.

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    Saw another option in Chesapeake Beach, along the Bay. They have a short but pleasant rail trail that uses some sort of composite material (perhaps combining plastic resins & recycled wood, a la Trex?) that worked well for a long over-marsh stretch.

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    So yes, there are multiple options that exist and are used successfully. Probably takes nothing more than money and momentum to move towards one of these....

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    ...and the lobbying effort required to "demonstrate the need".

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    Quote Originally Posted by JustinW View Post
    Saw another option in Chesapeake Beach, along the Bay. They have a short but pleasant rail trail that uses some sort of composite material (perhaps combining plastic resins & recycled wood, a la Trex?)
    I'm a big fan of composite, but it can be slippery.

    In any event, whatever the material, it would likely be not only better to ride on but more durable and require less maintenance and last much longer before needing replacement, which might justify the upfront cost. Of course, NPS/Congress may not care anyway.

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    The composite deck is used at Kenilworth Aquatic Gardens for their boardwalks out into the marsh.

    The composite would likely be an improvement, however one of the biggest challenges on Trollheim is the angle of he turns. It doesn’t feel like it but you’re making two quick sharp angled turns. Add just a bit of moisture and boom.

    The bridge could use a realignment to make the split going southbound more of a drift to the left and less of a left turn followed by an immediate right turn.

    Money is certainly a barrier to doing this but a much bigger factor is that moving any part of the bridge would require some extensive bureaucratic processes, namely an environmental assessment.

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    Quote Originally Posted by JustinW View Post
    Probably takes nothing more than ...
    Working cooperatively with the NPS


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    There is a composite or plastic plank example closer than that, right on Roosevelt Island itself.

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    Not sure if it's the same material. The problem with this one is that, since the water doesn't soak in at all, it beads and pools up on the surface. That's pretty much okay for walking, but will still lead to slipping out for some bike tires, especially on turns.

    I ran on it for years though and don't remember it ever growing slimy alga-like films, so we'd have that going for us.

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    On the slippery ART boardwalk near Bladensburg, God has installed a speed bump.

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    It's going to be improved/fixed/whatever https://www.arlnow.com/2018/11/20/bi...sevelt-island/.

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    Quote Originally Posted by ursus View Post
    It's going to be improved/fixed/whatever https://www.arlnow.com/2018/11/20/bi...sevelt-island/.
    This is the part of the document which may be of interest (page 5-21):

    MOUNT VERNON TRAIL BRIDGE 31
    • Repair and realign the Mount Vernon Trail Bridge 31 at the trail juncture,
    located south of the parking area (See Figure 162).
    • Replace and widen the bridge decking with non-weathering, textured,
    and well drained surfacing.
    • Install Mount Vernon Trail standard railings along all elevated portions of
    the Trail.
    • Clear the vegetation edge to improve sight distance. Improve wayfinding
    to give cyclists and pedestrians more advance warning on trail.

    Starting on 7-29 they go through the detailed options with 4 possibilities.

    LAND CIRCULATION – OFF-ISLAND TRAILS
    The Treatment Options for the Off-Island Trails pertain specifically to MVT
    Bridge 31, the elevated, decked portion of the MVT that beings approximately
    200 feet south of the Virginia approach to the TR Island pedestrian bridge. Four
    options were identified for the rehabilitation of Bridge 31. All alternatives would
    include horizontal realignment of the north end of Bridge 31, replacement of
    the bridge deck and railing to provide a smoother riding surface, and additional
    structure reinforcement to eliminate deck deflection.

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