Bridgeland

Bridgeland, Texas

Bridgeland is an 11,400-acre master-planned community northwest of Houston, Texas, which will be home to 65,000 residents when complete in 2037. Like the Woodlands, its predecessor, the Bridgeland site plan centers on scenic lakes that improve water quality, irrigate during droughts, and draw residents to common areas for recreation. These lakes form a stormwater system that exceeds local design requirements, and which has managed storm events much larger than those anticipated.

 

The Idea and the Site

The Howard Hughes Company (HHC) is a Dallas-based developer and operator of master-planned communities (MPCs) and mixed-use properties in 14 states. It is a successor of the Rouse Company, a pioneer in MPCs on the “new town” scale, including Columbia, Maryland; Summerlin, Nevada; and the Woodlands, Texas. In its investor materials, HHC says its large-scale MPC business “build[s] small cities that are their own ecosystems and high-barrier submarkets,” resulting in “some of the highest, risk-adjusted return opportunities” among public real estate companies.

Construction on the Woodlands, located 28 miles north of downtown Houston, began in 1966. It opened in 1974, and now has over 115,000 residents across more than 28,000 acres. Its pioneering design, helmed by influential landscape architect Ian McHarg, set a new standard for environmentally sensitive site planning, especially in the Houston region. “Builders found that they could love profits and trees at the same time,” said McHarg in 1975; preserving stands of trees and draining streets with bioswales both reduced upfront expenses and created a unique sense of place. (ULI awarded the Woodlands a 1994 Award for Excellence, and published a biography of its developer, George Mitchell, in 2004.)

As the Woodlands hit its stride in the 1990s, the developer began scouting for new sites elsewhere in the metropolitan area where it could replicate its success for a new audience. Much of Houston’s job growth in recent decades has occurred to the west and north, so the northwest sector along US 290 seemed like a strong bet. Rouse assembled a large site 25 miles from downtown, just beyond several 1980s subdivisions in the Cypress area, which has a well-regarded Cypress-Fairbanks (Cy-Fair) school district and a low crime rate. The site also sat astride the planned route of Grand Parkway (SH-99), a third beltway around Houston whose first leg opened in 1994. Its 2013 extension through Bridgeland, and its 2016 extension through the northern suburbs, offer nonstop access to job centers in the bustling I-10 Energy Corridor (see ULI Case Study, CityCentre) to the south and to Spring and the Woodlands to the northeast. (In 2017, HHC launched a third MPC in the region—the Woodlands Hills, ten miles north of the Woodlands.)

Bridgeland began construction in October 2003, and home sales began in 2006. At buildout, currently estimated for 2037, it will have 65,000 residents on its 11,400 acres. The first of Bridgeland’s four planned villages, Lakeland Village, is almost complete, with 8,300 residents in 3,400 homes; Parkland Village, the second village, opened in spring 2018. Lakeland Village fills most of the northeastern quadrant of Bridgeland, Parkland Village the southeast quadrant, Prairieland Village the southwest, and Creekland Village the northwest. At the site’s center, along Grand Parkway, a future 900-acre Bridgeland town center is planned.

Even by east Texas standards, the site has “no topography, and [has] soil with a high clay content, which means there’s little percolation,” says Heath Melton, vice president of master-planned community residential development at the Howard Hughes Corporation. Combined with the Gulf Coast’s intense summer rainfalls—three inches of rain can fall in 30 minutes, according to Mark Gehringer, senior project manager at Bridgeland—drainage is a key consideration for any potential master plan, and flooding is a risk anywhere, anytime.

Unlike the Woodlands, the Bridgeland site was a relatively treeless, flat, and once-marshy expanse of the vast Katy Prairie west of Houston, but later plowed under for rice farms and used as ranch land. Although the site is almost entirely flat, with a mere 0.05 percent slope from west to east, its sheer size means it outfalls into two primary watersheds. Cypress Creek runs along and across the north edge of the site, flowing from west to east across Houston’s north suburbs. The south edge of the site drains to Langham Creek, an intermittent stream roughly at Bridgeland’s southern boundary that flows southeast into the Addicks Reservoir and ultimately into Buffalo Bayou (see ULI Case Study, Buffalo Bayou Park).

Bridgeland includes much of the 5,000-acre watershed of K150, an intermittent feeder into Cypress Creek that flows generally northeastward through Lakeland Village and meets the creek at the site’s northeastern corner. K150’s streambed is the basis of Bridgeland’s detention, conveyance, and recreational corridor spanning the site from west of the Grand Parkway, east along the north edge of Bridgeland Creek Parkway, and north until it outfalls into Cypress Creek.

Planning and Design

In addition to Grand Parkway, six major thoroughfares span or border the site in both the north–south and east–west directions. These thoroughfares facilitate longer-distance trips with synchronized signals and no driveways, have rights-of-way at least 120 feet wide with landscape setbacks of 25 to 65 feet, and sit above the base flood elevation. Three span the site east–west: North Bridgeland Lake Parkway, which runs along its northern edge; Bridgeland Creek Parkway, which bisects the site; and Tuckerton, which runs along the southern edge. North–south thoroughfares include Westgreen, Mason, and Peek.

Secondary collector roads connect individual residences to services and amenities both within and between villages. These have two lanes and 60-foot-wide rights-of-way, with wide, 25- to 45-foot roadside landscape setbacks. Neighborhood streets discourage through-traffic with curvilinear routes and limited entrances. A pedestrian trail network combines sidewalks with a network of off-street trails; many follow waterfronts, which allows the trails to pass beneath thoroughfare bridges.

Parks and Landscape

When complete, Bridgeland will have over 3,000 acres of open space, including 900 acres of lakes, 400 acres of parks, and 250 miles of interlaced trails, positioning parks within a quarter-mile of every home.

As befitting its name, Bridgeland is centered on miles of lakes crossed by numerous streets, some on actual bridge structures, but most across enhanced culverts sized to manage water flows. Boathouses offer homeowners use of canoes and kayaks on the two-mile-long Cypress Lake or the three-mile-long Josey Lake. An island within Josey Lake’s upstream pool is punctuated with a two-story birding tower, accessed by a skybridge that sweeps across the lake and offers unobstructed views of the lake, which stretches for a mile to the west, east, and south. It engages visitors with the environment with fixed binoculars and interpretive signs introducing local wildlife.

Playgrounds are scattered throughout the site, as are small green spaces with special focuses—for instance, Tree House Park, where a two-story aerie sits within the branches of a century-old oak. Active-recreation amenities are clustered into larger community parks, including two within Lakeland. The 20-acre Village Park contains a pool, a skate park, a dog park, tennis courts, and basketball courts; the six-acre Activity Center within Lakeland Village has an indoor community center and swimming complex. In addition to conventional swimming pools, three “spray parks” offer relief from the summer heat.

Several other open spaces took cues from preexisting elements on the site. An overgrown farm levee that separated the rice fields from Cypress Creek is now a wooded ridgeline trail for mountain biking and hiking. Parkland’s future community park was sited within one of the site’s few forested areas, and the wooded K150 streambed remains as a greenway to buffer homes from a busy road.

Other open spaces repurpose land set aside for other infrastructure. Two east–west trails spanning Lakeland Village and Parkland Village make use of a preexisting road right-of-way and a pipeline easement offering easy connectivity to school campuses with minimal interaction with vehicular traffic. Several drill site areas also have been repurposed for open space and passive open play areas.

As Parkland Village launches, HHC is shifting Bridgeland’s planting palette from manicured lawns to more informal, meadow plantings, mirroring what HHC feels is a shift among buyers to emphasize their own connections with nature. This shift permits broader swaths of meadow and prairie-like grasses in place of lawns along roadside verges, near entry monuments, and—most important—at lake-edge wetlands. Melton commented that local bird watchers have already noticed an increase in species sighted at the first few areas that incorporate this planting palette.

Stormwater System

Bridgeland’s stormwater conveyance and detention system design meets or exceeds the requirements of the Harris County Flood Control District (HCFCD), beginning with its requirement to accommodate a 100-year storm. Michael Fitzgerald, the project’s chief consulting engineer, notes, “You can design to minimum criteria, but then you get the minimum resiliency.” Bridgeland’s stormwater system has been tested by two historic flood events: the Tax Day flood of 2016 and Hurricane Harvey in 2017.

Bridgeland front-loaded much of its drainage infrastructure, since Lakeland Village also happened to be where the site drained into Cypress Creek. Drainage was so critical to Lakeland’s execution that “we hired a civil engineer with an extensive drainage background to be our leading project manager,” Melton says.

Much of Lakeland Village brackets the stream tributary of K150, now reborn as the 140-acre Josey Lake. Although it has a single name, Josey is divided into a series of stair-step drainage lakes that use culverts that act as detainment or restriction points; their seven-foot-wide openings allow kayakers to pass through, and the roads above are given bridge-like railings in keeping with the community’s name.

Bridgeland Creek Parkway will run along the south shore of Josey Lake across much of Bridgeland’s east–west expanse, ensuring wide vistas even as the site develops. A greenway corridor between the lake shore and parkway creates a central spine with few road crossings, and pedestrian underpasses that double as stormwater conveyance channels connect underneath the parkway. Few houses back onto the parkways; instead, single-loaded streets ensure that passersby see homes’ front or side elevations.

Josey Lake cuts a new channel through the northeast corner of Lakeland Village; a one-mile segment of K150’s streambed near the site’s eastern boundary no longer flows directly into Cypress Creek, but instead acts as a dry and wooded channel flowing west into the lake. Rerouting K150, along with an open park (used as a disc golf course) along Cypress Creek, ensures that stormwater flow is contained within Bridgeland rather than spilling onto adjacent parcels to the east.

The lake was designed with eight feet of freeboard (unused stormwater capacity) and gently sloping edges that range from 6:1 to 10:1, instead of the maximum 3:1 slope allowed by county regulations. This allows for soft lake edges, and a wider green buffer between the lakes and homes. Aquatic plantings in many locations create a gradual transition zone and help minimize sediment from surface flows from the lakes. Open-space features near the lakeshore, including the birding tower, the aforementioned boathouse, a fishing pier, and an event lawn, are designed for immersion during significant rain events.

Josey’s final pool, at the north edge of the site, is separated from Cypress Creek by a level control structure (with six inches of freeboard) and an overflow channel. The three, five-foot-wide outfall pipes from that channel through the levee are the outfall into Cypress Creek for a majority of Bridgeland; they are cleaned of debris after each half-inch rain and are recertified annually by the HCFCD.

The Y-shaped overflow channel also drains overflow from another long lake, Cypress Lake, that runs along the north edge of the site; it is separated from Josey by a low berm, and from the creek valley by the Nature Trail atop the former farm levee. Cypress Lake was dug as on-site flood storage to compensate for regrading that lifted other parts of Lakeland Village out of the 100-year floodplain.

Bridgeland’s primary wetlands mitigation area begins around Mallard Lake, a former rice irrigation reservoir north of the future town center. It incorporates a 1,600-foot-wide corridor that stretches to the western boundary of the site.

Bridgeland’s southern edge drains into a different watershed, Langham Creek, where the HCFCD has taken a novel approach for Houston with its Langham Creek Frontier Program. This regional detention strategy combines an on average 700-foot-wide drainage easement, with a 14-foot-deep grade, and impact fees paid to the HCFCD. Most of the channel will be dry, except for one- to two-acre “plunge pools” along its length. Unlike with K150, where the entire basin sat within Bridgeland, negotiating the Frontier Program design implementation required more than three years of collaboration between three property owners and the HCFCD.

In Bridgeland, fill excavated from lake basins is used to elevate the subdivision sites. Street and utility excavation spoils further raise many finished lots. While Harris County requires finished floor elevations (slabs) to be 18 inches above a 100-year storm, a common practice in Bridgeland is to deliver lots at that elevation, putting foundation slabs even higher. “[These] step-ups at each of the lots . . . allowed the houses to sit higher on the lot, resulting in a higher amount of flood risk reduction,” says Gehringer.

As elsewhere in Houston, streets are an integral part of the stormwater conveyance system. Storm drains elsewhere can convey a two-year storm, and otherwise hold water in the streets. In Bridgeland, many of these drains are also oversized.

Water Sources

The extensive on-site lake system also is key to Bridgeland’s drought resilience strategy. East Texas is not only flood-prone but also drought-prone and having adequate water on site is key to reducing long-term landscape maintenance costs. Landscape irrigation at Bridgeland can tap into four different sources. The first is from the site’s stormwater sources, including Josey Lake and Cypress Lake. The second source is recycled wastewater, which is treated at an on-site plant and pumped into the lake system. A third option consists of using water rights where water can be withdrawn directly from Cypress Creek. On-site nonpotable groundwater wells provide the fourth and last-resort option. The entire irrigation system is distributed to public areas via an separate nonpotable (purple pipe) system, pressurized by multiple pump stations.

Flood Performance

The first big test of Lakeland Village’s drainage network came with the aforementioned Tax Day flood on April 15, 2016, when 15 inches of rain fell within 12 hours at Bridgeland’s western edge. This was calculated as a 600-year event for this area and set new high-water records, both for rainfall and for the water level in Cypress Creek. Even though Josey Lake had not yet been completed at the time, no homes and only isolated thoroughfares flooded. Remarkably, analysis (and aerial footage) after this flood showed that the stormwater system conveyed the local flows as designed. The high-water marks after the flood occurred not from local runoff, but from Cypress Creek exceeding it banks and flowing into Bridgeland’s lakes.

Hurricane Harvey brought a larger and more sustained rainfall, with 17 inches of rainfall over 24 hours, and 27 inches of rain in 48 hours. At Bridgeland’s western edge, the two-day rainfall total was considered a 5,000-year event. Standing water filled many streets (as is expected during an event of this magnitude) and flowed onto many yards, but again, no homes took on water—validating the team’s design standard decision. Remarkably, construction activities were able to resume within two to three weeks. During and after each event, numerous homeowners expressed gratitude for the foresight in planning for flood resilience; one wrote on Facebook, “It was worth paying $30,000 more to live here and not have my house flood.”

Observations and Lessons Learned

Understanding the site and its possibilities was key to creating a plan that would stand the test of time both from an economic and an environmental perspective, a lesson that the team learned from the Woodlands. “The site ended up with a different feel from the Woodlands,” notes Kolkhorst, and instead, the site plan draws from the site’s broad prairie views and long lakes. “From the second Cypress Lake pedestrian bridge, the long view to the west when the sun is setting is spectacular.” The connections drawn from the site to its site plan are ones that Bridgeland emphasizes through its marketing, which focuses on themes of balance, connection, and bridging the natural and built environments. A site of this scale also makes it easier to mitigate environmental impacts, such as floodplain changes, within the site.

Any project that takes a generation to develop must accommodate adjustments along the way, while also selling those changes to stakeholders who have already bought into the vision. Melton emphasizes that the developer has to be a good storyteller about how the changes ultimately improve upon the initial vision. When HHC shifted the amenities and landscaping to emphasize meadows, prairies, and nature, the team worried about the reception from Lakeland Village residents, who were used to manicured lawns. “Were residents going to accept going from a turf look to a looser landscape? Education can really tell that story, outline the vision, get people to understand, and buy in,” says Melton. “At Josey Lake, residents are absolutely in love with the concept and vision as we transition to different plantings.”

The stormwater system is another key infrastructure element that HHC has realized is an important story it needs to tell. Going beyond the stormwater requirements meant that the system has endured not only 100-year events, but also multiple events of far greater magnitude, and even managed to absorb an unexpected degree of overflow from Cypress Creek. It also exceeds the more stringent floodplain regulations issued by Harris County after Harvey, and has been improved with data learned from the most recent record floods.

“How the stormwater systems work is not obvious to most residents,” says Fitzgerald. Shortly after Harvey, the team was relieved about how well the system performed, but realized the need for better educational materials to provide residents with a level of comfort and understanding as water inundates streets. “We need to do a better job educating the residents in our community about how our drainage systems work. . . . I asked BGE to come up with exhibits that illustrate how the drainage system performs during different events, so when residents see water in the streets, [they know] that it is a function of the intended design,” says Melton. These exhibits will be shared with existing and prospective residents and will be part of an ongoing education effort.

Especially for an MPC, patience pays off in the long term. For instance, HHC made additional upfront investments in the purple-pipe system and perennial grasses along the lakeshores, because they would save on landscape maintenance—an obligation for the homeowners’ association, not even the developer. Even today, Bridgeland’s superior environment earns it a substantial price premium over its comps and sees faster sales.

 

The above is an excerpt from the ULI Case Study of Bridgeland. Read the full text here: https://casestudies.uli.org/bridgeland/