Originally Posted by
Gyrine
Foul - right at the top of the SDOT page:
"Based on survey data, 1969 Please note: We continue to make this page available due to public interest although the information is more than 40 years old and obsolete in some cases."
Huh ... look at that. To be fair, when you google "steepest paved hill in Seattle" and get to a list of paved streets with gradient down to a fraction of a percent ... you can understand why a person would think they found what they were looking for.
How does the data become obsolete since 1969 though? They haven't built or flattened any major hills for 100 years as far as I know?