A watershed is the geographical area where water collects into a single source, the term has been adapted by urban planners to refer to the geographical area around a location where it is easy to walk, in say about 20 minutes time.
Historically the area where I live was farmland just outside the urban boundary of the city of Rochester. It was bought up, plot by plot and new housing developments were built one-by-one. Between Rochester and Brighton there sits a string of hills formed when the glaciers receded, this geographical barrier kept the area from being developed until after WW1. As is visible in the map below, the street design incorporates some larger curved roads and a little bit of connectivity is lost between neighboring developments, but there’s still the idea of the grid as the basic building block.
The apartment complex where I live was built in the 1950 when the US was just starting to experiment with car-centric infrastructure. I wanted to see how the walkshed differed from some place developed earlier, and I’ll let the following images speak for themselves.
On this image I draw the 5, 10, 15, and 20 minute walksheds from my apartment. These lines are called “isochrons”, it should take the same amount of time to reach any point on the green line taking the most direct route available. The concentric circles are a theoretical walkshed, if you could go out in 1 direction unimpeded. These circles should roughly be increments of about a quarter mile, but in this example the the circles are a little small, I improved my technique between this picture and the next, so bear with me.
The point stands that connectivity is off though. Most of the 20 minute isochron is inside the 15-minute (yellow) theoretical walkshed, and some even dips into the 10-minue (orange) theoretical walkshed. This is in part because my apartment is near the rear of the complex and the only entrances are towards the south and east, nearly a worst-case scenario for walkablility.
There’s hardly a lack of amenities nearby, but the infrastructure around the area is clearly made with the car in mind. The biggest problem is that the roads were not designed for people to cross them comfortably, and the shops were not designed with the idea that people would be walking to them. They are spread out, and set far back from the road, a distance easily covered by car, but an uncomfortable distance for pedestrians to be mingling around cars. It would make a huge difference if there was a pedestrian connection to some of the side streets neighboring the apartment complex, and if the storefronts were along the pedestrian right-of-way with parking in the rear.
5 minutes:
I can just leave my apartment complex and reach the walgreens on the corner. It’s handy to have a convenience store so close, not many people do.
10 minutes
I can get to Pulaski Park, a plot of land originally bought up to run a highway through. I can get to this without crossing the street which is nice. The two streets that intersect near the apartment complex are 5-lanes wide and overbuilt for the amount of traffic they carry. The cycle time is pretty long too, so crossing may take up to a minute. But once you cross you can get to a bus stop, a 7/11, a gas station, some medical offices, other apartment complexes and McQuaid Jesuit high school.
15 minutes
I can reach a few more apartments and go up some residential streets. There’s also church and elderly care facility within this area. More importantly there’s a grocery store. Of course this store is set way back with a sea of parking in front.
20-minute walkshed
In this area you can walk to other shops in that grocery store plaza, including a liquor store, some small restaurants, the post office and a salon. Also more apartments, more residential houses, and some medical offices. A corner of Rochester’s Highland Park is just barely reachable.
Connectivity nearby
And now lets look at someplace close to my apartment, but within a more traditional street grid.
The connectivity of these streets is really something to behold. Each of the isochrons nearly match the theoretical maximum, suffering a little bit to the south as the string of hills along Highland Ave, create a barrier to walkability. Weirdly, Rochester’s irregular street pattern helps this connectivity too, the angled streets connect areas diagonal from each other better than an orthogonal grid.
Even with a 5 minute walk there are plenty of good restaurants, a barber, a pub, even a little park, one could almost get to downtown in 20 minutes. There’s some nearby schools and libraries in this range, and a large section of Highland ParK.
That’s not to say this region is “peak urbanism”. The highway cutting through the middle of the city is uncomfortable to cross. The overpass along Goodman street always has cars coming onto or off of the expressway, which makes it difficult to cross. Public transit can be a little inconsistent, and there’s a real lack of bike lanes, even though the area would be well served by more of them.
One closing thought, where I grew up there was pretty much nothing 1 mile in any direction besides other suburban houses and farmland. There was a creek that I could walk down to, and an old railway bed converted into a running/biking trail. But there were no shops, businesses, restaurants. I had to either take the bus or be driven to school. Despite this, I had fun, and there’s merits to that kind of environment. But I feel like I’d much rather live where I am now than where I grew up, despite all the overbuilt infrastructure.