connects SH 146 southwest to
La Porte. The city of Baytown is located at the mouth of the
San Jacinto River on
Galveston Bay, by road east of
Houston. According to the
United States Census Bureau, the city has a total area of , of which is land and , 2.92%, is covered by water. Baytown is located on the
Gulf coastal plain, and its vegetation is classified as temperate grassland and
marshes. The municipalities have been built on reclaimed marshes,
swamps, and
prairies, which are all still visible in undeveloped parts of the Galveston Bay area. Baytown is bordered by water on three sides. Along the south and west is Galveston Bay. On the east is
Cedar Bayou. The city is roughly bordered along the north by
Interstate 10. Portions of the city to the east of Cedar Bayou lie in
Chambers County. Flatness of the local terrain and proximity to the bay have made
flooding a recurring problem for the area. Baytown and surrounding communities once relied on
groundwater for its needs, but severe land
subsidence has forced much the city to turn to ground-level water sources.
Geology The land beneath Baytown consists of layers of sand and clay to great depths. These layers were created by millennia of river-borne
sediments which gradually incorporated plant and animal matter, creating the petroleum deposits for which the
Gulf Coast is now known. The region around the city has numerous
faults, many considered active, but none have produced significant earthquakes in recorded history. These faults tend to move at a smooth rate in what is termed "
fault creep", which reduces the risk of an earthquake.
Climate Baytown's climate is classified as
humid subtropical (
Cfa in
Köppen climate classification system). Spring
supercell thunderstorms sometimes create
tornadoes (but not to the extent found in
tornado alley). Prevailing winds from the south and southeast bring heat from the deserts of
Mexico and moisture from the
Gulf of Mexico. Summer temperatures typically have highs near though higher temperatures are not uncommon. The city's proximity to the bay and the winds that it generates moderate the area's temperatures and ease the effects of the humidity, creating a more pleasant climate than inland communities like Houston. Winters in the area are temperate with typical January high of and lows are near . Snowfall is rare. Baytown’s annual rainfall averages are around or exceed , making it one of the wetter cities of the lower 48. Excessive
ozone levels can occur due to industrial activities; nearby Houston is ranked among the most ozone-polluted cities in the United States. The industries located along the ship channel and the bay are a major cause of the pollution.
Hurricanes are a substantial concern during the fall season. Though
Galveston Island and the
Bolivar Peninsula provide some shielding, Baytown still faces more danger than Houston and other inland communities, particularly because of storm surge, as well as severe land subsidence in some low-lying areas of town due to excess pumping of groundwater in the 1960s (see
Brownwood subdivision) by area refineries and municipalities. Hurricanes
Carla (1961),
Alicia (1983),
Ike (2008), and
Harvey (2017) were the four most damaging hurricanes to affect Baytown. == Demographics ==