Tag Archives: Lake Mercer

The Shampoo Theory of Hiking

Fox Kits at Lake Mercer

Turn around. Look behind once in a while.

Did you ever see a squirrel or a deer cross a road in front of a car? Yeah, they do that. And you know what? They cross behind you, too.

The same thing happens when you hike in a park. Every once in a while you’ll see a deer, or a squirrel, or a fox jump out on the trail ahead of you. Every once in a while they do the same thing behind you. If you hike in an area often enough, you’ll learn that they cross those trails in the same places time and time again. It’s like the highway signs that warn of deer crossing. Those signs aren’t random. Deer repeatedly use those areas.

Animals, like people, are creatures of habit. Deer wander close to edges, where woods and meadows meet, so they often can be spotted near park entrances, along creeks, or along hiking paths. If you’re hiking along a maintained trail, keep an eye out on the forest floor for subtle pathways where plants appear to be pushed down or trampled. Sometimes those are trails blazed by people, but often they are animal trails. Remember those spots, because animals frequently use the same trails repeatedly.

Bass on a nest

It’s like fishing. If you catch a big fish, return to that spot in the future. There’s a reason that fish was there – maybe food, maybe shelter, maybe both. The same thing is going on in the woods. Animals return to the places that provide food, shelter and safe passage. If you like taking photos of wildlife, then remember where you see the animals and return to those places with camera in hand.

Study the weather when you hike. Meteorological conditions can impact wildlife. There are times on a walk in the woods you won’t hear a single bird singing or see any animal movement of any kind. There are other times when every bird in the neighborhood seems to be visiting your feeder, every animal in the woods is in motion, and every fish in the lake is feeding. Consider what the atmospheric conditions are when wildlife is active – sunlight, temperature, cloud cover, barometer, frontal passages, wind speed and direction, and even moon phase. Return when there are similar conditions, and there will be a good chance wildlife will be active again. For example, largemouth bass usually spawn on a new or full moon in spring on the north or northwest banks of a lake where the sun shines longest and when rising water temperatures reach the high 50s to mid 60s. Walk along shorelines under those conditions and look in the shallows for round, white circles where the fish have cleared their beds. Look closely and you’ll see bass circling those beds. Those same areas will draw bluegills in to spawn next when the water temperature rises a few more degrees. You can count on that happening year after year under the same meteorological conditions. Nature is like that. The more you observe, the more fascinating and predictable it becomes.

The best hiking/wildlife day I’ve had in Fairfax parks came during fall a couple of years ago. During an early morning, 45-minute walk at Lake Mercer I spied raptors, fox outside a den, antlered bucks giving their equivalent of high-fives along the water’s edge, a box turtle and countless serenading birds. It was a quiet, calm, cool morning after several consecutive days of steady, calm weather. Spring walks produce choruses of frogs and wildflowers in predictable places as wet, warming conditions repeat year after year.

Atmospheric conditions also can help you predict when wildlife is not active. Consider Washington summers, when temperatures boil into the 90s and days get so hot that not even the air wants to move. Not much wildlife in motion then, either.

So when you head out for a hike in a park this summer, take along this shampoo theory. Lather, rinse, repeat for consistent good hair. On your next hike, enjoy, look, listen and learn. Repeat for consistently good experiences. And increase your odds of seeing wildlife by occasionally turning around and looking back.

Author Dave Ochs is the manager of stewardship communications for the Fairfax County Park Authority’s Resource Management Division.

Fish On The Move: Huntsman Lake To Be Drained Later This Year

Contractors remove fish from Huntsman Lake.

Contractors remove fish from Huntsman Lake.

It was an unusual day for the fish. An adventurous one, too. They’ll certainly have something to talk about with their BFFs.

If they can find them.

On May 15, an estimated 800 to 1,000 pounds of fish were shocked, netted and moved from Huntsman Lake to Lake Mercer. Huntsman, a 28-acre lake in the Pohick Creek watershed, will be drained later this year to allow for dam maintenance, which would certainly have been an even larger inconvenience for the fish.

Ecologist Shannon Curtis of the county’s Department of Public Works & Environmental Services says that after Huntsman Lake is drained, the lake bottom will be dredged, and the sediment that has flowed into it in recent years because of erosion upstream will be removed. That means the lake will be deeper and, once again, more effective at trapping sediment, which Curtis says is one of the lake’s primary functions.

In addition, there will be some engineering work done on the Huntsman Lake dam.

There’s nothing wrong with the dam. The lake’s emergency spillway needs to be upgraded because there are new regulations governing dams. This is just an upgrade to meet the new regulations.

Fairfax County also is going to repair and replace the riser structure, which visitors to the lake see as a large concrete block standing out in the water near the dam. It houses the pipe that drains the lake into the stream below the dam, and it’s the work on this structure that requires that the lake be drained.

There will, unfortunately, be a loss of some fish that are in the lake. That’s why the shocking boat was on the waters saving as many fish as possible. The loss of fish means there may be a stench around the lake, and there could be visits from predators – hawks, eagles, foxes – looking for an easy meal.

There’s good news coming at the end of the project. “There’s a lake restoration plan that’s going to occur that’s actually going to improve the conditions of the lake,” Curtis said. Engineers plan to add an underwater berm, or ridge, across the upper part of the lake that will create a sediment forebay, a kind of pocket in the lake’s upper reaches. That pocket should catch most of the sediment coming into the lake and help the deeper part of the lake remain somewhat free of sediment. That also means the next time the lake requires dredging that engineers may not have to drain the entire lake. Rather, they can lower the water so that the silted-in area behind the berm can be dredged while water in the deeper, lower basin can be left in place.

There are shoreline improvement plans, water quality improvements and habitat improvements coming for the lake after the construction. Residents may notice a change in the flora around the shoreline.

Curtis says the shocking showed that the lake “currently actually has a very productive fishery in it.” Some nice largemouth bass in the two-to-four pound range were captured and moved to Lake Mercer. Once the construction work is complete and the lake is restored, it will be put on an annual stocking plan managed by state fisheries biologists.  Even better, the restoration plan includes creation of submerged habitat (structure) for fish, shoreline stabilizations and both wetland and aquatic vegetation plantings.

The entire project, “mucking up, draining, digging, dump trucks hauling dirt out, moving dirt, general construction activity” as Curtis puts it, is expected to start in late summer or fall and likely last six to eight months.

Written by Dave Ochs, manager, Stewardship Communications