Lake Accotink Park Fall 2026: November Events and Lake Plans

If you walked Lake Accotink this summer and heard that the county was deciding the lake's future, you may be wondering when that decision lands. Probably not until after 2027. Until then, November at 7500 Accotink Park Road has more on the schedule than most months. There are campfires, sunset fishing, a leaf hike, a marina cleanup and a 5K with a beaver in its name, all held at a lake whose eventual size hasn't been chosen.

Those two timelines are connected. The study is slow because the county is still measuring how much sediment Accotink Creek carries into the lake. So the water you fish from and walk around this fall is the same water the engineers are monitoring.

The decision is further out than "late 2026" suggests

The Smaller Lake Accotink Preservation Feasibility Study project page says the study should be finished by late 2026. Read the rest of the page, though. Field data collection continues through the end of 2027, and the page says that work may require updates to the study.

The county's frequently asked questions document sets out the order of events. The initial feasibility study is expected by the end of 2026 or early 2027. It will then be updated at the end of 2027 with more monitoring data. That means the final decision may not come until sometime after 2027, and county staff will wait for direction from the Fairfax County Board of Supervisors on how to proceed.

The Board started this work on January 23, 2024, with three studies. The Department of Public Works and Environmental Services is running a sedimentation study and a preservation feasibility study. The Fairfax County Park Authority is leading a dam assessment. The most recent public meeting was an open house on Saturday, June 6, 2026, at Kings Glen Elementary School in Springfield. Staff stood at stations around the room and talked through the study with the public.

So the November programs below happen on today's lake, during the years when it is being measured.

What a 20-to-40-acre lake means in dredging

The Board directed the county to look at keeping a lake of 20 to 40 acres, 4 to 8 feet deep. The June open house displayed 20-, 30- and 40-acre layouts side by side. They were options for comparison, and none had been selected.

The open house materials included preliminary dredging quantities for a 6-foot depth:

• 20 acres: about 131,000 cubic yards of dredging
• 30 acres: about 168,000 cubic yards
• 40 acres: about 205,000 cubic yards

Going from the smallest option to the largest doubles the surface area but adds only about 74,000 cubic yards, roughly 57 percent more dredging. The materials also listed disposal rates per cubic yard. These ranged from $10 at a distant dredged-material facility to $15 for quarry reclamation fill, $45 for dewatered material taken to a landfill and $113 for wet landfill waste. The materials state that those rates do not include dredging, dewatering or transport. Since those costs are left out, the rates don't add up to a project price, and none has been published.

The sediment comes mostly from stormwater. In heavy storms, runoff overflows Long Branch and Accotink Creek, erodes their banks and carries soil downstream into the lake.

The dam stays, with work ahead

The dam assessment has been the first piece to finish. A Park Authority status report dated September 2026, covering work through June 30, says the dam assessment report is complete. It also says conceptual dam modifications and cost estimates are underway, and that next steps depend on which options are chosen and whether funding is available. The structural assessment itself is dated March 6, 2026.

Here is how the county FAQ summarizes the findings:

"The Dam Assessment concluded that the spillway and stilling basin are in fair condition with localized areas in poor condition. The areas of poor condition require maintenance to address deficiencies, but ultimately the structure is serviceable."

The same document says the spillway needs substantial improvements so it can safely pass flood flows and meet state dam requirements. It also says dam removal is not planned, though the dam may need some modification depending on the final lake configuration. The FAQ addresses closures too. If construction eventually happens, which parts of the park close will depend on the chosen option and will be worked out during construction planning. No start date has been set.

None of that affects the next few weekends. The lake, the spillway and the loop trail are all in use this fall.

November on the water, week by week

The Park Authority's Lake Accotink activity listings start this Friday and continue all month. Several programs repeat, so a busy weekend doesn't mean you've missed them.

Haunted Pond is the closest date. It includes a twilight walk, trick-or-treating, animal activity stations and a campfire, which suits younger kids who aren't ready for a full Halloween night out.

November 7 has the most going on. With the leaf hike in the morning, Campfire Skills in the afternoon and sunset fishing at 4, a family could spend most of the day at the park. The leaf hike has only one session. Campfire Skills and sunset fishing both run again on Nov. 21, so those two can wait until later in the month. The fishing sessions are worth noting given everything above. They put kids on a lake whose depth and shoreline are the subject of the study.

Program pages can change, so check the listing before you go.

The FLAP weekends put volunteers at the marina

Friends of Lake Accotink Park, known as FLAP, lists several November events. These three put people to work at the park itself.

• Monthly park cleanup, Sunday, Nov. 8, 9 a.m. to noon, at the marina. Tasks include picking up trash and debris and refilling the dog-waste bag stations along the trails.
• Pollinator garden care, Sunday, Nov. 8, 10:30 a.m. to noon, at the Margaret Kinder Pollinator Garden. Volunteers can go straight from the cleanup to the garden.
• 4th Annual Beaver Boogie 5K Run or Walk, Saturday, Nov. 28, 9 a.m. to 1 p.m. Early packet pickup is Friday, Nov. 27, from 5 to 7 p.m. at Kilroy's.

The Beaver Boogie falls on the Saturday after Thanksgiving. That makes it an easy outing if you have family in town and want everyone outside after Thursday's dinner. FLAP's event pages list the day and date without a year, so confirm on Eventbrite when you register.

Cleanup at the marina and the 5K on the shoreline both happen on the ground the feasibility study is measuring. The trash collected now is a separate issue from the creek sediment, but the people who come out on Nov. 8 are spending a Sunday morning at the place the county will ask the public about in its next round of input.

The loop, and where to watch for changes

The county's Lake Accotink Loop Trail map shows a multi-surface loop of 3.9 miles. It also marks a short section of the Gerry Connolly Cross County Trail. The map dates to 2017, and another county listing puts the trail at 3.75 miles, so think of it as a loop of about four miles. The route starts under the old Orange and Alexandria Railroad trestle over Accotink Creek. That is the same creek carrying the sediment the study is tracking.

As of October 22, the Park Authority's park alerts page showed no closures or detours at Lake Accotink. It's a good page to check before a weekend walk. Any work tied to the dam would probably be posted there before it shows up anywhere else.

The project page has an email sign-up for updates, meeting announcements and opportunities to comment. The county has said it will share milestones through 2026 and 2027. The initial feasibility study is due around the turn of the year, so the next public update could come during the months these campfire and fishing programs are running.

If you have questions about how the Lake Accotink study and the plans around it could affect your corner of Springfield over the next few years, I'm glad to talk them through with you. I'm Jennifir Birtwhistle with Keller Williams Metro Center, and you can find me at Jennifir Birtwhistle. Let's Connect.