Not about, but precisely as high. That's why ISS was worth a look last night.
Wikipedia tells me that ISS has an inclination of 51.65 deg and an altitude of 409 - 416 km. The picture shows ISS reaching 19.2 degrees, which is 19.15 corrected for refraction, as seen from 59.97N. This gives me a computed altitude of 412.2 km for ISS [assuming it passed dead south], which is within the altitude given by Wikipedia. This is assuming a spherical earth, but these calculations should still be accurate within a few tens of a degree for sure.
EDIT: Heavens Above says it was at maximum altitude for my position (59.97N 10.65E) at 23:24:07 last night and ISSTracker.com gives ISS' position at that time as 51.77N 11.29E and 406.9 km altitude. Using this position I calculate an altitude of 404.6 km, which is within reasonable uncertainties.
So, in its current orbit, it doesn't get higher (had I been slightly further to the east, the altitude would be 0.02 degrees higher, though, but that's less than a pixel in the image).