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Trigger depths and completion targets

When the Plow Actually Comes

The gap between when snow becomes a problem and when a municipal plow is obliged to do something about it is the reason seasonal contracts exist in this county.

Work is carried out by an independent snow removal operator under their own company name and insurance. This site arranges the introduction and clears nothing itself.

The Triggers

Published Residential Plow Thresholds

What each city publishes about residential street plowing. Blank means the city does not publish a figure.
CityResidential triggerCompletion target
Birmingham2.5 inchesNot published. Automatic parking ban at 4 inches on roadways — a civil infraction to park, towed at the owner’s cost, with exemptions for residents without driveways and handicap permits.
NoviUp to 3 inches, majors around the clock and locals in business hours only. Above 3 inches, locals once majors are safe.Not published
Farmington Hills4 inches in 24 hours. Below that, spot salting of hills, curves and intersections only.Within two days
TroyMore than 4 inches4–8 inches: 24 hours from storm end. 8–12 inches: 36 hours. Over 12 inches: 48 hours.
Rochester HillsTwo priority levels; specifics not publishedNot published

Troy also publishes its priority classes, which are a useful model for anyone scoping a commercial property: A, major city and county roads with a 12-hour bare-pavement target; B, industrial; C, school entries; D, city facilities; E, local and subdivision streets plus hills, intersections, curves and gravel; F, sidewalks, parks and cemeteries.

The Gap

Four Inches Is More Snow Than Most Storms Bring

Sum NOAA’s 1991–2020 normals for Detroit Metro and an average season produces about 13.6 days with an inch or more and 4.3 days with three inches or more. The monthly picture: November 1.9 inches, December 8.9, January 14.0, February 12.5, March 6.2, April 1.5 — 45.0 inches a year across 37.6 days with measurable snow.

Put that beside the table above. In Troy and Farmington Hills, the large majority of the winter happens below the depth at which anything official comes down a subdivision street. What happens instead, in Farmington Hills’ own description, is spot salting of hills, curves and intersections — which does nothing for a driveway, a walk or a private road.

That gap is precisely the space a two-inch contract trigger fills, and it is why the trigger is the most important line in a residential agreement here. The arithmetic of buying a season.

RCOC

Why Subdivision Streets Are Last, in Their Own Words

The Road Commission for Oakland County sets priority by traffic volume and speed, with hills and curves as modifiers, and publishes winter maintenance guidelines annually. Roads carrying more than 40,000 vehicles a day are cleared first. Then, in RCOC’s own phrasing: “So, what roads are at the bottom of the priority list? Unfortunately, it is our subdivision streets.”

The reasoning it gives is hard to argue with — there is little point being able to leave your subdivision if the main roads are impassable. The scale is the other half: RCOC has more than 1,300 miles of subdivision street to reach, after more than 1,400 miles of major county road and 230 miles of multi-lane state highway.

Two operational details from the same guidelines are worth knowing. Drivers are capped at 16 continuous hours. And salt begins to lose effectiveness below 20°F, with sand rather than salt used on gravel roads — of which the county has more than 750 miles.

RCOC names two worst cases explicitly: a heavy storm starting just before rush hour, when trucks cannot move faster than the traffic; and a storm that runs for days, when trucks must stay on the main roads and cannot get into subdivisions at all.

Geography

The North End Gets Measurably More

The National Weather Service’s Detroit/Pontiac station documentation states that average seasonal snowfall at Detroit Metropolitan Airport is 41 inches, while average annual snowfall near the office location is 60 to 70 inches — and that office sits in White Lake Township, in Oakland County, on one of the highest locations in southeast Michigan.

Individual storms run the same gradient. The February 12–13, 2025 event forecast 4 to 6 inches for Farmington Hills, Birmingham, Troy, Royal Oak and Southfield; 5 to 7 inches for Novi, Bloomfield Hills, Clarkston, Commerce Township, Pontiac and Rochester Hills; and 6 to 8 inches for Oxford Township, Lake Orion, Addison Township and Leonard.

One honest caveat: no published NOAA seasonal normal exists for a Pontiac or Oakland County station specifically, so the 60 to 70 inch figure is the Weather Service’s own description of conditions near its office rather than a formal normals-period statistic. It is cited here as what it is.

Still Want Someone Else to Handle It?

Knowing the rule and having the time to satisfy it are different problems. Describe the property and get a season price.

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