While it’s easy to derisively brand American suburbia as
homogenous and essentially unchanging since it emerged as the preferred
settlement pattern for the majority of Americans fifty years ago, we hardly
need an intense study to see how much they’ve evolved since the postwar housing
boom that began in the late 1940s.
In fact, this “study” glosses over it about as superficially as you
can. But it gets the point across,
and it provides the backdrop for an interesting glimpse at what innovations (if
that’s the right word) we typically see today.
Go back in history and take a look at the street pattern
from subdivisions that sprouted across the purlieus of major metros in the
1950s and early 1960s—about the same time that the Federal Aid Highway Act of
1956 galvanized construction of limited-access expressways through the hearts
of medium and large American cities.
By the time President Eisenhower authorized the Federal Interstate
Highway System, this segment of Levittown, PA (outside Philadelphia) had
already enjoyed several consecutive years of astronomical growth:
By today’s standards, Levittown’s homes are modestly sized,
the lots small enough to force the homes close together, and the
garages/driveways barely accommodate two cars.
But they still represent a remarkable achievement in
enabling homeownership to an emergent middle-class that had never enjoyed such
a luxury in the past, particularly when the crippling Great Depression brought
virtually all housing construction (and ensuing growth in independent
households) to a screeching halt. Average
people could afford these homes.
Now let’s do the time warp again thirty years more, by
veering about 10 miles closer to central Philly. Witness the change in the layout of the streets:
While everything contained in this Google Map rests within the municipal
boundaries of Philadelphia (unlike anything from the previous Levittown map),
the most appropriate description of the neighborhoods outlined here is
“transitional”. The street
configurations to the west of the large, bisecting Pennypack Creek Park still
mostly abide by the conventional street grid that Philadelphia and most
American cities used as the basis for neighborhood design until around World
War II. However, the east side of
Pennypack begins to display a mix of conventional grids along with the same carefully
ordered curvilinear streets that dominate Levittown further to the north. Housing developers after World War II, at
the onset of the baby boom, began experimenting with street designs that boldly
defied the four-way stop and quadrilateral. These new subdivisions meandered and undulated, continuing
uninterrupted without any intersections for much longer intervals than any grid
would allow. The William Levitts
of the era gambled by speculating that Middle America would buy into sinuous
streets that, though potentially more confusing and less suitable for
navigation, helped break the visual monotony of a street that stretched to the
horizon line. Curvilinear streets
seemed to work well in the prestigious pioneering streetcar suburbs designed by
Frederick Law Olmsted, such as Riverside, Illinois (outside Chicago) or Shaker
Heights, Ohio (outside Cleveland).
Why not export this typology to the middle classes?
The gamble paid off in spades, and first-time homeowners
embraced the street design that all three of the major Levittowns employed. Before long, virtually every major
metro witnessed the development of communities that followed the Levittown
model, with most proliferating at about the same time that the central cities
endured the cataclysm of interstate highway construction right through the central
neighborhoods. Thus, it should
come as no surprise that these 1950s suburbs nearly always stretch in close
proximity to either their city’s major interstate highway, the circular
beltways (with three-digit numbers instead of two) or both.
But this elegantly winding braid of streets still generally
lacks something we associate with today’s suburbia: complete automobile
dependency. It might not be easy
or particularly desirable, but usually Levittowns are still tightly organized
enough that it is possible to walk to a few destinations. Purely hierarchical street patterns—in
which one “trunk” road provides access to “branches” and then still smaller
sprouts—did not catch on until later, meaning we have to go back to the future
(and much, much further out from the city center) to see the sort of
development patterns that emerged in the late 1960s and 70s. The map of upper Bucks County (north of
Levittown) proves this.
By the time the overwhelming majority of households had at
least one car, it became de rigueur
for developers to build according to these expansive street configurations, resulting
in subdivisions that emphasized homeowners’ privacy at the expense of any real
walkability. With homes spaced
much further apart, yards were larger, and no amenities stood conveniently
within walking distance, even back on the collector or arterial that provided
access to the subdivisions. Nobody
who bought into these developments gave any consideration that they would get
anywhere except by car. Quite a few developments built during the 60s and 70s
didn’t have sidewalks.
Housing from this time period isn’t as abundant as are the
examples from the 1950s, because fewer households were organizing into
families. A moderate baby bust
followed the boom. Interestingly,
home sizes grew even as the birth rate plunged; thus, individual households had
more space to their own than any time in history—both inside and outside the
house. Demand for shared green space reached a nadir. Public parks in these regions are particularly scarce, since
private yards typically sufficed.
The few parks in Upper Bucks County must devote a significant amount of
space to parking lots, because they are inevitably unreachable by foot.
It was this time period that the cul-de-sac evolved from a
suburban novelty to a sine qua non in
subdivision development; families soon specifically sought them out. The early 1960s developments often
didn’t even bother with the circular patch of pavement that allowed vehicles to
turn around; the roads just terminated in dead ends, particularly when these
new suburbs were pushing into unincorporated areas well beyond the inner-ring
suburbs. Most municipalities
eventually required roads to end in cul-de-sacs. While the curvilinear configuration of the 1950s remained
popular, by this point many of the streets in a subdivision terminated in a
court. The lack of a thruway
discouraged all cars except for those belonging to people who lived on that
cul-de-sac, dramatically lowering traffic volume, increasing privacy and giving
the suburban subdivision a quiet, low-density settlement pattern that almost
resembled rural living.
I’m not sure when the next subtle generation in subdivision
design truly emerged, but it would probably correlate to the late 1970s and
early 1980s, when the now-adult Baby Boomers began starting their own
families—the echo boom. Household
formation picked up pace, and these young families generally sought new
construction just as their parents had.
While some of the new developments took on an expansive
form—particularly the luxury ones or those where land was cheap and abundant—quite
a few homebuilders tightened the design.
In many cases, average lot sizes retreated slightly, even while square
footage to the homes continued a steady growth. Perhaps recognizing that they had renounced too many neighborhood
essentials (or perhaps because more municipalities began mandating them), the developers
of suburbs from the 1980s and onward regularly featured amenities such as storm
sewers, curbs, and sidewalks (at least on one side of the street). As a compensation for the slightly
smaller yards, these subdivisions (particularly the larger ones) would often include
some shared open space in the form of greenery around a decorative retention
pond, a community clubhouse, or a soccer field.
Why did this happen? Why did subdivisions return to a
slightly higher, more urban density than the decades prior? My own suspicion is that some of it was
prescriptive: through ordinances, municipalities started requiring culs-de-sac
instead of dead ends, or storm sewers instead of drainage ditches, which drove
up development costs. Also,
formerly unincorporated lands began incorporating and immediately raising the
minimum standards for subdivision design.
Developers, in turn, couldn’t necessarily pass these imposed costs
directly to the consumer, so instead they found a trade-off with smaller lot
sizes, squeezing more homes into a newly platted piece of land. The result looks something like the
quintessential 1980s/90s suburb below:
If this photo looks unusually flat for something in
Pennsylvania, that’s because it isn’t Pennsylvania. The subdivision pictured above is in the outskirts of Baton
Rouge, Louisiana. While such a shift
in location may seem eccentric or even unexplainable, Baton Rouge offers much
more abundant examples of the 1980s subdivisions, having grown considerably at
a time when the more mature metro of Philadelphia was fairly stagnant.
This subdivision also demonstrates another, subtler
evolution in street design: the 90-degree cul-de-sac. Notice the shift in the street from the photo below, as well
as the parallel sidewalk.
The buffer strip between the sidewalk and the street seems a
bit larger than normal, but other than that, nothing is likely to catch the eye
as out of the ordinary. But then,
upon entering the bend in the road, the sidewalk takes a more generous cut into
people’s front yards, veering strangely close to their front porches.
Why would they have done this? It almost appears to me that authorities approved the site
plan without thoroughly vetting it.
While there’s nothing wrong per say about having a sidewalk so close to
a house, it’s also hard to see why the average buyer would prefer it to a
parcel where the sidewalk is much closer to the street.
Elsewhere, in a similar neighborhood down the road, one can
witness another insertion of the cul-de-sac into a 90-degree-turn. Though the homes are more modest, the
design of the sidewalk seems a bit more conventional, and, as a result, more
effective.
But look at the grassy island in the middle. The lawn is poorly maintained, and the
absence of any other landscaping makes it seem like an afterthought—like some
sort of padding.
In neither of the two above examples is the execution as
effective as it should be, which makes me suspect that the developers really
didn’t know what they were doing.
Or they didn’t care. It’s
not a tough concept, though if these worm’s-eye photographs don’t convey it,
this bird’s-eye Google Map should, taken from a subdivision of similar design in
the same part of town.
Notice how the 90-degree bends stretch into curvy
culs-de-sac? This road design is a
shrewd method to make a little more money by cramming an additional parcel or
two into the same space. If the
road were to employ a conventional l-shaped bend, the lots that directly front
the bend would be even more strictly wedge shaped, to the point that the street
frontage wouldn’t be wide enough to allow individual driveways. Or, one house would claim an enormous
side yard from the land that is completely unreachable by a driveway. With a gentle arc in its place, each
house gets more or less the same linear footage as access to the street, and
the surveyors who put together the original plat could fit in another parcel or
two. And a more conscientious
developer could transform grassy patch in the center of the cul-de-sac into an
attractive, verdant amenity.
There’s nothing subversive or unethical about this design;
it simply demonstrates that, particularly for moderate or middle-income
households, developers have learned they can slice away at some of the yard
size. The homes featured in the
photos and map above all come from Gardere, a lower and moderate-income area on
the otherwise affluent south side of Baton Rouge. My suspicion is that these subdivisions exist through some
form of Low-Income Housing Tax Credits: they’re newer, in better condition, and
bear some of the “neo-traditional” design features that federal housing
programs love to employ. Because
the average buyer for these properties doesn’t have the money to be choosy,
developers can take huge liberties, and they don’t necessarily worry about
details like attractively landscaped common area or well-designed sidewalks. And, in the grand evolutionary arc (pun
fully intended) of American settlements, this represents one more design
strategy pushing us further from the look and feel of the original Levittown. Suburban developments are neither
uniform nor unchanging. I’m not
confident that the conventional grid will ever become the standard again, even though
New Urbanist advocates have successfully implemented it in specialized niche
developments throughout the country.
(After all, does anyone openly claim to be a New Urbanist anymore?) But I absolutely trust that
culs-de-sac and street curves have a long way to grow before the design
calcifies. And it probably never
will. The evolution continues.