Preliminary 1999 Iowa Bypass Study. Prepared by Snyder & Associates, Inc. for the Iowa Dept. of Transportation and presented to the Bloomfield City Council & Community Wednesday, September 29, 1999. Why Iowa Builds Bypasses.
Prepared bySnyder & Associates, Inc.
Iowa Dept. of Transportation
and presented to the
Bloomfield City Council & Community
Wednesday, September 29, 1999
Bypass Community Pop. Bypass Route Year Bypass Opened
Long term, no significant negative impact; some benefit from encouraging location of basic industries (results in spin off $ in other sectors).
Short term, only negative impacts in some travel related/dependant businesses.
Towns over 2,000 pop. and county seat most likely to see community-wide benefit.
Commercial property values on “old route” do not decrease.
In larger, established towns, traffic on the “old route” is close to pre-bypass volumes.
Percentage of “impulse” or drive-by customers is declining - not as big as in 1970s.
More impact than Bypass:
Fuel efficient cars
Changing travel habits/ commuting
Urbanization of the MidwestConclusions of Previous Research
Merchants thought bypass improved “quality of life” & shopping environment.
Safety, noise, etc. improved in downtown and residentail areas after the bypass.
Merchants observed traffic reductions but reported little (or no) loss of business activity.
Growth tends to spread along “connector” roads to bypass interchanges.
Distance of the downtown from the bypass has no long term impact.
Travel related businesses that close after bypass are usually replaced.
Communities realized that a highway improvement and bypass will require preparation & planning.Conclusions of Previous Research
* Centerville, Grundy Center, Oelwein, Shenandoah, Vinton, Washington, West Liberty.
Indicates year bypass opened shopping environment.FY71-97 Retail Sales Index1960-70s Bypass Communities
Sample communities under
2,000 population, limited CBD
Sample communities over
5,000 population, CBD, destination
Indexed on FY 1989 = 1.0
Avg. all Iowa cities
Every community thought that the bypass had been beneficial, especially for removing trucks/through traffic, & improving safety and the quality of life.
Those towns that benefited most planned for changes or took advantage of new situations & opportunities.
Working with DOT can help to achieve best results/orientation of the bypass to benefit town.
Population was unaffected.
In larger communities, traffic on “old route” is increasing (& generally higher volumes than on the bypass). Retail sales and city valuations are generally not negatively impacted.
Safety, noise, etc. is improved in neighboring streets.
Bypasses play a small role in overall economic vitality: regional & ag. economy, commuting, urbanization, access to regional highways, etc. all more important.Study Conclusions