Mosquito Creek Lake

At a glance

Before the lake

The land that now sits under Mosquito Creek Lake was first offered for sale by the Connecticut Land Company, the Western Reserve's proprietor, in 1795, and the first settlers arrived in Bazetta Township in 1805. Samuel Bacon moved into the township in 1816 and ran a sawmill there for more than three decades. The settlement that grew up around him was known locally as "Baconsburg" long before it had any official name; it didn't become Cortland until the railroad reached it in 1874, and the village -- unlike the farmland around it -- sits on the lake's shore today rather than under it, per Cortland's own historical timeline.

The valley took its name, as local legend has it, because it was "festooned with mosquitoes," a nuisance that early hunters prized the area for hunting despite. No 18th- or 19th-century source has turned up to confirm the story directly, so it survives as a durable local tale rather than a documented fact. What is well documented is that the creek's valley flooded often, part of a broader Mahoning River watershed flood problem that repeatedly damaged the steel-mill towns of Warren, Niles and Youngstown downstream.

Planning for a lake here traces to 1920, when engineer Alexander Potter surveyed the valley and "first demonstrated the practical feasibility of creating a lake and implementing flood control dams in the region." Formal federal authorization followed nearly two decades later, on June 28, 1938, when Congress passed the Flood Control Act of 1938 (Public Law 75-761, House Document 306), naming the project as a way "to alleviate floods on the Mahoning, Beaver and Ohio rivers" and to supply water to Warren. Mosquito Creek Lake became one of 16 flood-control projects the Corps' Pittsburgh District still operates.

Building the dam

Money for construction moved fast once wartime industrial pressure entered the picture. A contemporaneous 1943 national wire item confirms the appropriation directly: the Second Deficiency Appropriation Act, approved July 12, 1943, allotted $4,385,000 "for construction work on a dam and reservoir project on Mosquito Creek in Ohio, near Youngstown." The project moved forward specifically because Mahoning Valley steel mills, running flat-out for the war effort, needed low-flow augmentation to keep their process water cool -- the Federal War Production Board approved the construction explicitly to benefit the Youngstown steel mills.

Groundbreaking ceremonies were held July 24, 1943, and work on the embankment began under contract within days. What followed was fast enough that the project earned its enduring local nickname: the dam was substantially built within 90 days, giving rise to "the 90-Day Wonder." Impoundment began January 1, 1944, using temporary bulkheads because the permanent sluice gates hadn't yet arrived; by June 30, 1944, the Corps considered the project 62 percent physically complete. Full construction was declared complete in April 1944.

Building the lake meant taking land across at least three Trumbull County townships along the creek valley: Bazetta (the dam site and much of the pool footprint), Mecca (upstream farmland) and Greene (whose southern reaches, per a 1945 local account, mark the lake's northern extent, running to about a mile south of State Route 87). By the close of fiscal year 1944 the Corps had acquired 11,226 acres in fee simple plus flowage easements over another 141 acres, reported at the time as about 95 percent of the eventual total. A later federal accounting settles the long-term figure at 11,180.4 acres held in fee plus easements over a further 276 acres, a total project footprint of 11,456.4 acres, well beyond the pool itself. Clearing removed 4,560 acres of timber and brush from the reservoir footprint, and the 1944 Annual Report candidly notes that clearing wasn't fully finished before some areas were already inundated by rising water.

Local reporting describes farmers and residents of Mecca, Bazetta and Greene townships as reluctant to give up land to the project but, as with any federal flood-control condemnation of the era, without much practical recourse. The single best-documented human cost of the project is the relocation of the old Bazetta Cemetery: in 1943, the Army Corps of Engineers moved roughly 400 graves from the cemetery's original site on what's now Route 305 to the West Bazetta Cemetery before the old ground went under the reservoir. The 1944 Annual Report adds a detail no other source captures: "two cemeteries affected by the reservoir were removed and relocated by contract" that year, meaning a second relocated cemetery is now confirmed to exist, though it hasn't been identified by name or location in the sources available. A draft Corps/ODNR Environmental Assessment adds that portions of several east-west roads were also inundated when the dam went up and remain submerged under the lake today, though it doesn't name them.

A 156-page 1874 county atlas, read plate by plate, fills in some of the names on that flooded ground, though not confirmed compensation. In Bazetta Township, where the dam itself sits, the Casterline family -- Jno., Z. and A. Casterline -- held the largest concentration of adjoining parcels directly astride the creek, sections 25 through 37, more land on the flooded corridor than any other family the atlas shows. A "Town House," the township hall and school, is marked on the plat near section 46. Upstream in Greene Township, the atlas shows creek-front parcels near the village of Greensburg held by the Cory, Bascom and Sloan families. These are candidate pre-condemnation landowners identified from a 69-year-old map, not verified buyout records; no deed index, condemnation case, or compensation figure for any named family has surfaced.

Stories

Baconsburg before Cortland

Before it was Cortland, the settlement that would become the lake's east-shore anchor was known locally as Baconsburg, after Samuel Bacon, who ran a sawmill there for more than thirty years starting in 1816. The town survived the reservoir; it's the farmland and the old burying ground around it that didn't.

Four hundred graves, one summer

In 1943, with the dam already rising, the Corps of Engineers moved roughly 400 graves out of the old Bazetta Cemetery and reburied them at West Bazetta Cemetery ahead of the flooding. No name list, no account of how families were notified, and no record of what became of the original headstones has turned up -- the fact of the move survives; the texture of it mostly doesn't.

A lake with its own escape hatch

Almost every Ohio flood-control dam has a spillway built of concrete. Mosquito Creek Lake's is a stretch of low ground: the Mosquito Creek-Grand River divide, at the lake's upper end. If the pool climbs high enough, toward 904 feet, water simply keeps going where the land lets it -- south and east into a Grand River tributary bound for Lake Erie, instead of back down Mosquito Creek toward the dam. It isn't a design flourish; it's terrain doing the engineer's job for free, and in its most extreme floods the lake briefly drains into two different watersheds at once, according to the Corps' own project page.

The weekend the lake almost filled

On April 27, 2025, a storm nobody had forecast as a flood risk parked itself over the watershed and dropped more than two inches of rain in under a day. The pool rose from 901 feet to 902.55-902.56 feet over the weekend -- flood-storage utilization jumped from 7 percent full to 67 percent almost overnight, the fourth-highest pool the Corps has recorded since the dam was finished in 1944. "This was an unexpected event," the Corps' own Water Management Unit lead, Megan Gottlieb, said afterward. "There was no high-water forecast." Outflow was held near 850 cubic feet per second, below the roughly 1,000 cfs downstream channel capacity that protects Niles and Youngstown, according to DVIDS. A follow-up report from WFMJ put the event in context with the lake's full top-four record: 1947 (all-time record, 902.97 ft), 1994 (902.58 ft), 2011 (902.57 ft) and 2025 (902.55 ft).

A president's name on a state park, briefly proposed

In March 2021, state Rep. Michael Loychik introduced a bill to rename Mosquito Lake State Park after Donald Trump, at an estimated cost of roughly $300,000 for new signage and materials. ODNR pushed back, and locals countered with their own suggestion: name it instead for Warren-born suffragist Harriet Taylor Upton, a nationally significant figure in the women's-suffrage movement. Neither change happened; the bill sat in committee for years and appears to have quietly died, per Tribune Chronicle.

"Just go up to Erie, Dearie"

A lure named after a marital in-joke put a small shop near the causeway on the map of every serious Lake Erie walleye angler. In the 1950s, Dan Galbincea II ran the Causeway Sports Shop near Mosquito Lake with his wife, Helen, who raised five children while minding the counter. Fed up with her fishing-obsessed husband's constant talk of another trip north, Helen would tell him, "Just go up to Erie, Dearie." The name stuck to a spoon-style lure Dan started making himself, patented, and originally sold for 89 cents apiece -- it retails for about $5.50 today. The family developed more than 30 patented lure designs before selling the business around 2010; Dan Galbincea II died in June 1996 and had been inducted into the Ohio Sportsmen's Hall of Fame in 1984. As of mid-2025, Mecca Township trustees were pursuing an official Ohio historical marker for the Erie Dearie, with a Trumbull County Planning Commission application deadline in May 2026, per Tribune Chronicle.

The valley's oldest loss

The Mecca Township Historical Society states plainly that "Mosquito Lake covers the only Native American burial ground in Mecca." No site name, tribal affiliation, or record of excavation or relocation accompanies the claim, and no corroborating account from a state archaeology office or a Corps cultural-resources survey has been found to confirm whether the site was documented before the valley flooded, or simply submerged. If true, it would predate and outweigh the Bazetta Cemetery relocation as the oldest human loss under the reservoir -- but it remains an unconfirmed claim rather than a documented one.

The lake since

The Corps and ODNR entered a joint-management agreement in 1946 that still governs the park; ODNR operates Mosquito Lake State Park on land leased from the Corps. In 1971, the U.S. Board on Geographic Names officially changed the project's name from "Mosquito Creek Reservoir" to "Mosquito Creek Lake." The State Route 88 causeway bisects the lake, and its northern portion is a designated waterfowl refuge where boating and fishing are prohibited.

The lake's biggest recent controversy has been ecological rather than political. Hydrilla, described by park ranger Jamison Conley as "very concerning, invasive, and more destructive than any other plant," was first flagged in 2021 alongside Eurasian watermilfoil, spreading fast enough that Trumbull County commissioners voted in April 2024 to spend $300,000 over three years fighting it, hiring a lake-management contractor for fluridone chemical treatment; state funds of $330,350 were separately allocated the same year, per Tribune Chronicle. Not everyone welcomed the spending: a 2025 letter to the editor argued the treatment risked undoing water-clarity gains from zebra mussels and septic-system improvements. Zebra mussels, for their part, are established in the lake and have measurably clarified the water column by filter-feeding; a low probability of Asian carp reaching the lake has also been assessed, though the methodology wasn't independently confirmed.

The lake has also become a genuine fisheries engine for the state: ODNR's District 3 fisheries office nets walleye broodstock here every spring, sending eggs to hatcheries including Senecaville, Hebron and Grand Lake St. Marys, and Mosquito is described as the perennial leader among Ohio's inland walleye lakes. Bald eagles have rebounded dramatically along the shoreline, from 7 counted in 2018 to 27 by 2020. The park has invested heavily in recreation infrastructure recently, including a $2.5 million marina that opened in 2023 and a nature-center complex, built from cabins relocated from Pymatuning State Park, that opened in August 2026.

Safety incidents recur on the lake's ice and open water: a 27-year-old Youngstown man drowned in July 2018 after swimming past the marked buoys into water where the bottom drops off sharply, and a 16-year-old Cortland teenager drowned in June 2017, found after a two-day search involving sonar-equipped boats and divers. Winter brings its own hazards; USACE and local fire and police departments have repeatedly warned against going out on the ice, citing incidents of vehicles and pedestrians breaking through.

Federal planners are still not done with the lake. In December 2024, the U.S. House passed the Thomas R. Carper Water Resources Development Act, authorizing a Mosquito Creek Lake flood-risk-management and water-supply-modification feasibility study among more than 200 nationwide, with a related Niles-area study addressing downed trees and shoreline issues in the watershed.

The water

Mosquito Creek Lake was authorized in part, under the 1938 Flood Control Act, to supply the city of Warren with municipal water, and a dedicated water-supply outlet was built into the dam during original construction. A 1998 U.S. Geological Survey cooperative study with the city states plainly in its abstract that "the city of Warren relies on the lake as a sole source of potable water." A 2025 local-leaders forum put a number on that dependency: the lake supplies drinking water to an estimated 75,000 residents (an earlier 2021 planning meeting had cited a higher figure of 100,000, a discrepancy not resolved between the two sources), with major industrial water users including the Lordstown Energy Center and an incoming Kimberly-Clark facility, and a $25 million upgrade to Warren's water filtration plant underway as of that report. Cortland, on the lake's opposite shore, relies instead on its own Cussewago Sandstone aquifer for drinking water, and most other residences around the lake use domestic wells.

The area sits atop the historic Mecca Oil Pool, discovered in 1860, and since the 1970s atop active drilling in the deeper Clinton sandstone. The same 1998 USGS study, sampling in 1997, found no evidence that oil, gas or brine from those deeper wells was migrating into the shallow aquifers, the lake or its tributaries, concluding that crude oil from the historic shallow oil pool "probably does not seep into Mosquito Creek Lake." Naturally occurring methane, generated by microbial activity in the shallow rock rather than the deeper gas formation, has nonetheless turned up at notable concentrations in Cortland's public-supply wells and domestic wells near the lake's southern shore, a natural condition unrelated to modern drilling. A June 2008 E. coli warning at the state-park swimming beach, later attributed to a possible testing error, confirmed how Warren treats what it draws: raw water is disinfected at the city's Elm Road treatment plant, which was running 51 bacterial samples a month with no E. coli detections as of that report.

Mosquito Creek's drainage basin covers roughly 97 to 97.5 square miles above the dam, part of the larger Mahoning River sub-basin. The Corps' own Data API has tracked pool elevation hourly since roughly May 2013, a record of more than 115,000 instantaneous readings, exceeding even the co-located USGS stream gage, which only starts in 2017. Within that public record, the pool has ranged from a low of 897.63 feet on October 18, 2016, to a high of 902.56 feet on April 27, 2025; the all-time record, predating the digital era, remains 902.97 feet, set June 4, 1947.

Sources

• Ohio reservoir stops flash storm from damaging floods downstream communities toward Youngstown -- DVIDS/USACE Pittsburgh District, April 2025
• Water in Trumbull County's Mosquito Lake nearing decades old record level -- WFMJ, April 2025
• Bugged by a name: What would you like to call Mosquito Lake State Park? -- Tribune Chronicle, March 2021
• Fighting the aquatic invasion at Mosquito Creek Lake will require careful planning -- DVIDS/USACE, October 2021
• Commissioners approve funding to eliminate invasive species at Mosquito Lake -- Tribune Chronicle, April 2024
• State funds to improve Mosquito Lake water -- Tribune Chronicle, June 2024
• Morning at Mosquito highlights economic potential, invasive hydrilla problem -- Tribune Chronicle, August 2025
• Mecca seeks marker to recognize Erie Dearie fishing lure -- Tribune Chronicle, June 2025
• Mosquito Lake drowning victim named -- Tribune Chronicle, July 2018
• Body found in lake ID'd as missing local teen -- Tribune Chronicle, June 2017
• Bald eagle population soaring at Mosquito Lake -- Tribune Chronicle, January 2020
• New marina reels in visitors -- Tribune Chronicle, April 2023
• Nature center complex opens at Mosquito Lake State Park -- Tribune Chronicle, August 2026
• ODNR excited about walleye growth -- Tribune Chronicle, March 2025
• Mosquito Creek, Niles feasibility studies included in bill -- Tribune Chronicle, December 2024
• Water quality warning issued at Mosquito Lake -- The Vindicator, June 2008 (via Wayback Machine)
• Reservoirs ready for heavy rainfall -- The Vindicator, September 2018 (via Wayback Machine)
• Appropriations bill wire item, July 6, 1943 -- The Wilmington Morning Star, via Library of Congress Chronicling America