Thursday, November 06, 2014

Don Morse Beach


This is a fairly new beach (2012?), part of a major rehabilitation of this park on the north side of the town of Chelan.  It appears to be a nice example of what happens when a team of landscape architects, waterfront engineers, and shoreline designers come together with a community willing to try something new.

AERIAL VIEW

The beach is constructed of pea gravel organized behind a couple of rock groins that reorient the beach to better take advantage of the westerly waves.  It looked like the beach was still making small adjustments - which is sort of typical for these kinds of projects. And must be an interesting challenge on lakes with substantial swings in water level over the year.

There is a broad sandy backshore, somewhere beneath which is the original bulkhead (or at least that's how I understand it).



Manson


I covered the south side of the lake as far as  I could in the car (25-Mile Creek), before backtracking to town and heading up the northeast side toward (and beyond) Manson, which is a few miles up the lake from Chelan.

Most of this shoreline is bumper to bumper waterfront homes, built out on fill and perched on bulkheads. If there were originally natural beaches at this lake elevation, they would be long buried beneath houses and lawns.


There are a few beaches where the orientation (generally towards the upper end of the lake) and available sediment (native or imported) were favorable, but not many.

AERIAL VIEW

There was a nice little pocket beach in Manson itself (Manson Bay Park), tucked behind a pier/breakwater that shelters it from the waves coming down the lake.  As with the other sites, I'd like to see this in the winter when the lake level is lower.



Lakeside Park




Lakeside Park is located on a point on the south side of the lake near town.  It's got a nice swash-aligned beach facing right up the lake on its western shore, It's not completely swash-aligned, as the beach seems to be trying to leak northward past the ramps and the dock and the rock groin at the tip of the point.

The north-facing shoreline is more complicated.  There's a broad beach with a backshore wallow (that's probably not how it's advertised) - maybe a warm water pool for kids to play in during the summer?

AERIAL VIEW




The foreshore immediately east of the rock groin at the point is bare of sediment (except for a narrow gravel bar) suggesting that wind waves coming down the lake tend to move sediment towards town.  This also fits with the very steep submerged edge of the fine gravel beach at the east end, where it appears to be spilling off into deeper water.  I guess it would look different during lower lake lake levels later in the year.


Lake Chelan State Park



This is the first of several posts from a Sunday spent exploring the lower end of Lake Chelan two weeks ago.  It was nice to have a pleasant day to explore without having to compete with summertime traffic and the background buzz of jet skis.

Lake Chelan reminded me that I have a lot to learn about constructed beaches on lakes with managed water levels. Which I've come to realize are common aspects of developed, recreational lakes, not exceptions.

The lake level has been managed since the late 1800s (the modern dam was built in 1927, but apparently the first couple each blew out immediately) and its modern level is somewhat higher than its original level - on average - since both historic and modern varied/vary a lot with runoff. Currently, the Chelan PUD, which manages the dam, keeps the water level within a 20' range - and within a much narrower range in the summer when waterfront property owners and boaters demand both depth and predictability.  I believe the water level during these shots is a few feet lower than the normal summer level (just short of 1100' above sea level), as best as I can tell.

Not surprisingly, there was once a glacier in this trough. The result is a very deep lake (almost 1500', which means it extends below sea level) - and I suppose it competes with Hood Canal as the state's best fjord.  The longest lake in Washington drains via the shortest river in the state, which plunges four hundred feet over four miles to meet the Columbia (Lake Entiat, behind Rocky Reach Dam). Or it would plunge, were not the entire flow bypassed down to the powerhouse via pipes - which makes the Chelan River not only the shortest river in Washington, but also the driest?

AERIAL VIEW

Lake Chelan State Park is on the southwest shore.  The swimming beach is convex waterward and is exposed to waves from multiple directions, but perhaps it's sheltered position from down-lake winds provides some stability. I suspect - but don't know for sure - that this beach may be periodically replenished, or at least scraped back together now and then.

The sign indicated that the beach was built in 1975. I suspect this refers to the basic architecture of the shoreline, which is backed by grassy terraces separated by retaining walls, but maybe it also refers to the beach itself?



Saturday, October 11, 2014

Elwha Delta




The Elwha Delta continues to build outward in step with the delivery of sediment from the reservoirs behind the Elwha and Glines Canyon Dams. Both dams are gone, the river is running freely, and an amazing amount of sand has made it to the river mouth, although there is a lot more still to come. 

Gravel is beginning to appear on the new bars and spits at the river mouth, although I suspect it will take repeated cycles of river mouth movement and wave action to recycle and sort this material before more persistent coarse-grained features can form.

For a more thorough update on what's been going on, you might start with Ian's most recent post on the Elwha and then move backwards:
Coast Nerd Gazette: September 2014


One of the most interesting questions, at least to me, is how growth of the delta will eventually contribute to transport of gravel farther down the coast towards Port Angeles. This probably isn't a slow dribbling of material to downdrift beaches, but rather it may be driven by events that release larger plugs of material - a shift in the river mouth, a big storm, the growth of a new spit on the east side - who knows?  I'm glad folks are watching.

Previous posts on Gravel Beach:
Elwha Delta (October 2010)
Elwha Delta (March 2013)
Elwha Delta (July 2013)

There's a lot of great material online about the Elwha and the changes occurring on the coast. Besides The Coast Nerd Gazette, check the National Park Service, and the Coastal Watershed Institute. Lynda Mapes has written Elwha: A River Reborn and there is a documentary film, Return of the River out as well.



Hollywood Beach




Hollywood Beach in Port Angeles is one of those neat little pocket beaches that can form when sediment is trapped against an artificial headland - and which are pretty common in heavily modified shorelines. The beach is neither natural nor intentionally created. It just sort of happened and has evolved to become a neat recreational resource.


The original shoreline was located much farther to the south, nearer the base of the original bluff, but in the early 1900s the Port Angeles shoreline was filled outward and the original beach was buried, along with the remnants of the native village that once lay at the mouth of Ennis Creek.


Karl Wegman and others provide a very nice analysis of the original shoreline and its subsequent reconfiguration, with an emphasis on the archaeological implications at:
http://onlinelibrary.wiley.com/doi/10.1002/arp.1431/abstract
Also, Peninsula Daily News (May 2010)


Some lower portions of Hollywood Beach were marked off where, earlier this summer, depressions began to appear. There was much speculation about the mysterious sinkholes and I'm not quite sure where it all got left. Because the modern beach is located on top of many feet of fill, there could be any number of things underneath the beach that might give rise to this.  It sounds like one of the most likely explanations is that this is the result of old logs and wood rotting out.


The eastern part of the beach is covered in fine dark wood particles, although I don't know if this came from this location or floated in from elsewhere. Port Angeles Harbor has been in the wood products business for its' entire history and there are no shortage of possible sources of this kind of material.





Sunday, September 28, 2014

Coeur d'Alene


We spent the second week of September on the road again. Between Seattle and Minnesota again. We're getting pretty good at it, even though we never do it the same way. As usual, there was plenty of neat scenery and some geographic highlights, but not many beaches. This one in Coeur d'Alene was the only one.

AERIAL VIEW

I know little about this one - other than it is called City Beach. It lies west of the big resort complex and east of the lake's outlet (the start of the Spokane River). It's oriented pretty much toward the greatest fetch on this part of the lake. It stretches west from Independence Point - a headland formed by a stepped concrete revetment that even includes a little waterfall and a moose.

I believe the lake level is controlled by the dam at Post Falls, several miles downstream, and is therefore likely higher than it was naturally. And in recreational settings like this, beaches have often been created, sculpted, or at least supplemented with additional sediment.  But I really don't know much more of its history. It would have been fun to explore a little more, but this was the last day of a long trip and we were anxious to get home. I grabbed coffee at Calypso's and we were on our way.

For those more interested in our road trip than in beaches, you can always check it out at:
hshipman: "roadtrip2014"





Seahurst Park




These photos were taken way back on August 27th, just a few days after Seahurst Park reopened after being closed for year. At some point, I'll come back and post a longer follow up on the recent project, but I'm still in catch-up mode and will stick to little more than a few photos.

The bottom line is that the beach has been restored, an awful lot of old seawall and riprap and fill removed, and a small stream daylighted. All the responses I overheard from the folks wandering around were positive, although I suspect some were also just trying to line up what they were seeing with what they remembered.  The seawall was a useful reference point and now most of it is gone.

AERIAL VIEW

Seahurst Park: January 2014 (during construction, with links to earlier posts)


March's Point



This was a very quick stop at the end of the day (back during the third week of August), but enough time to see how this new beach was sorting itself out. I posted from here last fall, but the weather was awfully bleak and the photos awfully gray.  At that time, I said eventually I'd post more, and I guess that't still likely, but it's not now.

Bottom line - very simple (they're never really simple) beach nourishment along the toe of the bank a couple of years ago with a lot of initial reorganization of sediment.

AERIAL VIEW

The site is along the west side of March's Point, north of the old railroad trestle (now Tommy Thompson Trail).





Seafarer's Park



I've fallen way behind - a week in August on Salt Spring and another week driving back and forth from Minnesota in September resulted in some beaches being collected, but not yet stuck in the album.  So I'll add them quickly - with abbreviated comments - so I can check this off my list.



This is a neat park on the site of the old Scott Paper mill. The site has been cleaned up. Two new breakwaters were installed to replace the dilapidated timber wall that used to protect this side of the entrance to Cap Sante Marina and to provide shelter for small boats launching from the new pier. There was always a small pocket beach in the cove on the park's north side, but the low tide beach is no longer a tangle of rotting wood and the upper beach is clean gravel, not broken bricks and debris.

AERIAL VIEW

There's a lot more that I'd like to add about this site, but that will have to wait for a future post.