Nowhere in America do mile markers matter more than Alaska. The highways have names instead of numbers, the mileposts double as street addresses, and in winter, knowing exactly where you are isn't a convenience — it's survival planning. Here's how it works.

How Alaska numbers its highways — it mostly doesn't

Alaskans know their roads by name: the Glenn, the Parks, the Seward, the Richardson, the Sterling. Route numbers exist on paper, but nobody uses them. Instead, locations are given as mileposts along the named highway — "Mile 99 Glenn Highway" is a real address, the kind that appears on mailboxes, lodge signs, and trailhead directions. Mile marker data for Alaska's highways is bundled into MileCheck and works offline, which matters in a state where the signal disappears for an hour at a time.

The corridors people actually drive

  • The Glenn Highway runs northeast from Anchorage through Palmer toward Glennallen.
  • The Parks Highway connects Anchorage and Fairbanks past Denali.
  • The Seward Highway follows Turnagain Arm south from Anchorage to Seward on the Kenai Peninsula.
  • The Richardson Highway links Valdez to Fairbanks; the Sterling Highway carries fishing traffic to Soldotna and Homer.

The Seward Highway counts down

Here's the quirk visitors miss: the Seward Highway is measured from Seward, so the mileposts count down as you drive south from Anchorage — roughly milepost 127 in town, dropping through Girdwood around mile 90 and Moose Pass near mile 29, to milepost 0 at Seward. Locals give directions accordingly: the scenic pull-offs along Turnagain Arm, the Girdwood turnoff, the combat-fishing holes — all by milepost, all counting toward zero.

MP 0 · Seward MP 50 MP 100 MP 127 · Anchorage Moose Pass Anchorage Girdwood · MP 90
The Seward Highway is measured from Seward, so the mileposts count down as you drive south from Anchorage (MP 127) past Girdwood and Moose Pass to the harbor at MP 0.

Winter driving where position is survival

Alaska winters make position reporting non-optional. Black ice, avalanche zones along Turnagain Arm, moose on the road in the dark, and temperatures that make waiting for help a serious matter — when something goes wrong, "Mile 71 Glenn, northbound side" is the difference between a fast response and a search. Alaska's winter road reports describe conditions by highway and milepost, so the mileposts are the language the whole system speaks.

Live Alaska DOT alerts, in one place

MileCheck pulls live road alerts from Alaska's 511 system: closures, winter road conditions — including impassable-road warnings — and construction, tied to the milepost so you can see what's ahead on the Glenn or the Parks before you're an hour from the nearest plow.

Everyday and emergency

Whether you're giving directions to a lodge at Mile 99 Glenn Highway, reporting a moose strike on the Parks, or watching the ice reports before Turnagain Arm, the milepost is the location Alaska runs on — literally, as an address. MileCheck shows yours in real time, down to a tenth of a mile, even where the cell signal drops — with CarPlay and Android Auto for the long hauls.

Keep reading

More state guides: Washington

Essentials: What to tell 911 on the highway  ·  How to find your mile marker  ·  Browse the live mile marker map  ·  All 50 states