Where the Forest Preserves Touch the Backyard: Pest and Wildlife Help in Forest Glen, Sauganash and Edgebrook

Caldwell's Reserve, the Milwaukee Road and 1889

Most of this community area began as Caldwell's Reserve, the tract along the Chicago River granted to the Potawatomi leader Billy Caldwell, known as Sauganash. A surveyor's landmark called the Treaty Elm stood until the 1930s. Captain William Hazelton, a Civil War cavalry veteran, was the first European American to settle Forest Glen, and the house he built still stands. Chicago annexed the area in 1889 along with the rest of Jefferson Township, but for decades it behaved like a string of railroad villages. The Milwaukee Road, today's Metra Milwaukee District North line, still stops at both Edgebrook and Forest Glen.

Growth came in layers. Old Edgebrook's first big houses went up in the 1890s for railroad executives. Sauganash was platted after 1919, and its first eight homes went up on Kostner in 1923. Some Sauganash tracts stayed open prairie into the mid-1950s, so postwar ranches and Cape Cods sit beside Tudor revivals. The population grew from about 4,000 in 1930 to more than 20,000 by 1970. Nearly all of it is detached houses on lots larger than the city norm, and many of those lots back onto Cook County forest preserve land.

For pest control, that history shapes everything. The houses are old enough to have tired chimneys, weathered trim and stone or block foundations. The yards are big enough for oaks, stumps and woodpiles. And the land next door is woodland, floodplain and golf course that no one will ever build on. Most Chicago neighborhoods worry about rats in the alley. Here the calls are mostly about animals that live in the woods and visit the house at night.

Raccoons from the North Branch woods

Raccoons are the most frequent serious call in Community Area 12. Caldwell Woods, LaBagh Woods and the riverbank between them hold a large, stable population, with hollow trees, culverts and dense brush for cover. The houses offer something better in late winter: a dry, warm, quiet cavity. A pregnant female from February onward is looking for an uncapped masonry flue, a plastic roof vent she can tear open, a soft soffit corner or a detached garage with an open loft. Old Edgebrook, which is surrounded by preserve land, and the Wildwood triangle see this every year.

The signs are rarely subtle. Heavy walking overhead at dusk and before dawn, chirring or whimpering inside a chimney in April and May, shingles peeled back near a vent, muddy prints on a downspout or droppings collected on a flat garage roof are all typical. Raccoon latrines can hold roundworm eggs that stay infective in soil and insulation for a long time, so leave cleanup to someone with the right protection and disinfecting methods.

Removal is about sequence. From March into June a den may hold kits, and trapping the mother alone leaves them to starve in the wall. A wildlife specialist confirms whether young are present, removes them by hand for reuniting with the mother outside or lets the family leave on its own through a one-way door, and then closes the opening with heavy steel mesh or flashing. A properly sized stainless chimney cap is often the most useful repair on these houses. Relocating raccoons is regulated in Illinois, and releasing them into the preserves next door is not an option for homeowners.

Bats and squirrels on intricate period roofs

The Sauganash Historic District, listed on the National Register in 2010, counts 468 contributing buildings put up between 1912 and 1950 on roughly 160 acres. Many are English cottage and Tudor designs, with steep main roofs, cross gables, valleys, eyebrow dormers, slate or clay tile and big chimneys. Old Edgebrook's older houses add deep eaves and wood trim. Each junction is a place where flashing, mortar or trim can open up after 80 or 100 years, and a big brown bat needs only about three-quarters of an inch to get in.

Bats are the signature problem on those roofs. Watch for small dark droppings stuck to siding or a windowsill under a gable, greasy staining at a chimney edge, faint scratching in a wall at dusk, or bats leaving the same corner of the roof each evening. Little brown bats occur here too. Bats are protected and eat huge numbers of insects, so they are excluded with one-way tubes or netting, never killed. Pups cannot fly in early summer, so most specialists avoid exclusion from about June through July and do the bulk of the work in August and early fall.

Gray and fox squirrels work the same rooflines by day. Oaks along the river and in yards drop heavy acorn crops in some years, and attic calls rise the winter after. Squirrels chew rounded holes in eave returns, dormer cheeks and fascia, often where a limb touches the roof. Running and scratching just after sunrise points to squirrels. Heavy movement at night suggests a raccoon. Telling a provider what you hear and when helps them bring the right equipment.

Skunks, opossums, snakes and moles at ground level

Striped skunks and Virginia opossums come out of the preserves to forage in lawns and look for dens under decks, stoops, sheds and the low porches on postwar ranches. A lawn covered overnight in small cone-shaped holes usually means a skunk digging for grubs. Skunks mate in late winter, which is when the smell near a foundation is strongest. A specialist confirms which animal is denning, lets it leave through a one-way door and then buries an L-shaped hardware cloth barrier around the structure so the next one cannot dig back in.

Garter snakes and brown snakes turn up in window wells and garden beds near the river every spring. Both are native, harmless and protected in Illinois, and they eat slugs and insects. Window well covers and sealed gaps at the foundation keep them out of basements. Eastern moles push ridges through the deep, shaded lawns in Sauganash and Edgebrook during moist spring and fall weather. They do not enter houses, and trapping in active runs works far better than repellents. Coyotes travel the North Branch corridor as well; they rarely need removal, but small pets should be supervised after dark.

Indoors: deer mice, carpenter ants and damp basements

Two kinds of mice share this community area. House mice behave the way they do everywhere in Chicago. Deer mice, with white bellies and bicolored tails, live along woodland and field edges and move into garages, sheds, stored patio cushions and basements each fall. Deer mice are the main regional carrier of hantavirus. Ventilate the space, wet droppings and nests with disinfectant and wear gloves before cleanup, and never sweep or vacuum them dry. Garage door sweeps and sealed sill gaps stop most of them.

Carpenter ants are the leading insect complaint. Mature trees mean dead limbs and old stumps, which often hold the parent colony. Satellite nests then form in damp wood on the house: a window sill under failing glazing, a porch roof, or trim at the base of a slate roof where gutters overflow. Large black ants indoors in March or winged ants in May are a reason to call. Near the river, low basements also draw millipedes, earwigs and house centipedes after heavy rain. Dehumidifiers, working gutters and sealed cracks do more than spraying.

Old Edgebrook house, Sauganash Tudor or postwar ranch

Each of the three main house types fails in its own places, and a good inspection starts there. The list below summarizes what providers tend to check first. Telling a technician which type you own, and roughly when it was built, saves time on the first visit and points them toward the right ladders, roof equipment and sealing materials. The garage and the yard get their own look, because on these lots they are often where trouble starts.

• 1890s to 1910s Old Edgebrook house: large unlined chimneys, deep wood eaves, stone foundations with soft mortar, and detached garages with open lofts that raccoons and opossums use as day dens
• 1920s to 1940s Sauganash revival home: chimney flashing on slate or tile roofs, gaps where gable trim meets brick or stucco, unscreened gable louvers and rolled eaves that bats and squirrels enter
• 1940s and 1950s colonial, Cape Cod or ranch: attached garages, crawlspace vents near grade, low basement windows and deck skirting where mice, snakes and skunks get in
• Any lot backing onto the preserves: woodpiles, stumps and birdseed that pull wildlife and carpenter ants toward the house

A year beside Caldwell Woods and LaBagh Woods

Timing matters more here than in most of the city, because many jobs involve young animals and protected species. Sealing at the wrong moment can trap kits or bat pups inside, which is inhumane and leads to an odor problem days later. This is the typical rhythm on wooded blocks along the North Branch. Use it to decide when to inspect, when to seal and when to wait, keeping in mind that a mild winter can push everything forward a few weeks.

• January to March: raccoon and skunk mating; females search for chimneys, attics and space under stoops
• March to June: raccoon kits and squirrel litters in dens; check for young before closing any opening
• April and May: carpenter ant swarms, mole ridges in wet lawns, snakes emerging near foundations
• June and July: bat maternity season; exclusion usually waits until pups can fly
• August and September: main bat exclusion window and peak skunk digging for grubs
• October to December: deer mice and house mice move indoors; a good time to cap chimneys and screen vents

Wildlife-proofing for wooded lots

On lots that touch preserve land, keeping animals out of the yard is impossible. The goal is to keep them out of the house, the garage and the space under the deck. These steps focus on the roofline and the ground line, where nearly every entry happens. Work through them before late winter, when raccoons and squirrels start searching for den sites, and repeat the roof check every few years as trim and flashing age.

• Fit a stainless or copper cap on every flue, including unused ones
• Replace plastic roof vents with metal and back gable louvers with heavy mesh
• Seal gaps at chimney flashing, gable trim and eave returns, outside bat pup season
• Trench hardware cloth in an L shape around decks, stoops and sheds
• Close garage lofts, add door sweeps and keep overhead doors shut after dark
• Store birdseed, pet food and garbage in metal containers inside the garage
• Remove stumps and dead limbs, and trim branches back from the roof

How a wildlife job runs on a historic roof

Nuisance wildlife removal in Illinois falls to permitted wildlife control operators, so ask about permits up front. A typical visit starts with a full inspection of the chimney, roofline, vents, foundation and garage, followed by an explanation of which animal is involved, whether young are likely present and how exclusion will work. Expect at least two trips: one to install one-way doors and seal secondary gaps, and one to close the final opening once the animals are out. A bat in a bedroom or a raccoon that has come down a flue into the house is treated as urgent, and a same-day visit can often be arranged.

National Register listing in Sauganash does not require private owners to get approval for pest work, but the materials still matter. Ask how the provider works on slate and tile without cracking it, whether they use roof ladders and walk pads, and what they seal with. Copper mesh, painted sheet metal and color-matched sealants are good signs. Expanding foam on visible trim is a bad one. Request photos of every gap found and how it was closed, and keep them with your house records for future repairs.