Bridge Series: Suspended-Deck Suspension Bridge Traditional Cache

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Shaddow: I hate to let this one go, it's one of my all time favorite placements but I simply have less time for maintenance

Thanks to everyone that hunting this

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Hidden : 12/16/2009
Difficulty:
3.5 out of 5
Terrain:
2.5 out of 5

Size: Size: micro (micro)

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Geocache Description:

Suspended-Deck Suspension Bridge (Pedestrian) Spanning The Snoqualmie River

Suspension bridges have the longest spans of any type of bridge. They also have a very long history; probably the first examples of simple suspension bridges used jungle vines strung across rivers and tied to trees on either side. In modern times the vine is replaced with steel cables for obvious reasons.

Simple Suspension Bridge
diagram courtesy of Wikipedia



Simple suspension bridges have several drawbacks including the need for high attachment points to overcome cable sag as well as a significantly sloping deck surface.

Suspended-Deck Suspension Bridge
diagram courtesy of Wikipedia



These drawbacks are addressed in a Suspended-Deck Suspension Bridge by installing intermediate towers, usually two in number, under the cables lifting into the air until the lowest point of the cable is located higher then the deck that will be suspended below it.

Simplified Diagram
diagram courtesy of How Stuff Works



Bridge Diagram
diagram courtesy of How Stuff Works



The design of a Suspended-Deck Suspension Bridges is very straight forward. The cables are in tension and are held into place at the ends by very large anchorages. The cables drape over the towers and support the bridge deck with hanging cables.

Some notable examples of Suspended-Deck Suspension Bridges include:
Tacoma Narrows Bridges (WA)
Golden Gate Bridge (CA)
Brooklyn Bridge (NY)
Mackinaw Bridge (MI)
Akashi-Kaikyo Bridge (Kobe, Japan)

The Cache

The cache is log-only so bring a pen. The cache is located on the bridge; it might be a good idea to bring a friend if heights are a concern. And, of course, be careful not to drop the cache into the water below.

Park hours for all King County parks are dawn to dusk, which is about 20 minutes or so before/after sun-up/sun-down. Be sure to remove your vehicle from the parking lot, and past the gate located quite a ways up the road, by then or it will be locked in overnight. Respect all parks rules while hunting the cache; any violators of park rules will permanently loose their smiley. Today’s dawn, sunrise, sunset and dusk times can be found here.

Additional Hints (Decrypt)

Vg'f abg rivy

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)


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