The Hillsborough River in Tampa

The Hillsborough River forms in the Green Swamp and runs 54 miles to Tampa Bay, crossing rural Pasco, Polk and Hillsborough counties before it passes residential neighborhoods, a 1,300-acre reservoir and an urban landscape of concrete seawalls and industry (SWFWMD Hillsborough River site).

The land draining to the Hillsborough River covers more than 675 square miles. Its northern and central portions are generally rural, with public conservation lands, pastures and agriculture, while the southern end, which holds the City of Tampa, is urban and industrial (SWFWMD, watershed).

A Southwest Florida Water Management District fact sheet from October 12, 2007, splits the Hillsborough River watershed into four sub-basins: Blackwater Creek, Lake Thonotosassa and Flint Creek, Cypress Creek, and the Mainstem, which covers the upper, middle and lower river. The same sheet calls the Hillsborough the most urbanized river discharging into Tampa Bay and says its freshwater flow matters for the salinity and habitat of the estuary (SWFWMD fact sheet, 2007).

Length and area figures for the Hillsborough River differ even within the district. Its river education site gives 54 miles and more than 675 square miles, while its Green Swamp page lists a total length of 55 miles, a drainage area of 690 square miles, headwaters in southeast Pasco County and the mouth at Hillsborough Bay (SWFWMD, Four Rivers Emerge). The May 2026 version of this page gave more than 60 miles; the district pages checked for this rewrite give 54 and 55.

The Hillsborough River is Tampa's primary water source, and the City of Tampa Water Department's Tippin Water Treatment Facility can produce up to 120 million gallons of drinking water in a peak day (City of Tampa Water Department).

The full name is the David L. Tippin Water Treatment Facility. Across a year the Tippin plant averages 82 million gallons a day, and the city says that when the Hillsborough River cannot meet demand in extended or extreme dry periods, Tampa purchases water from Tampa Bay Water, in the form of treated regional groundwater, surface water and desalinated seawater (City of Tampa, About Us). Upstream, inside the Lower Hillsborough Wilderness Preserve, Tampa Bay Water manages 20 wells at the Morris Bridge wellfield that pump from the Floridan aquifer for the City of Tampa (SWFWMD, tributaries).

Because the river is the supply, a dry year in the Hillsborough River basin shows up in Tampa yards. The city has enforced year-round watering rules since 1992, and it has been under a Modified Phase III (Extreme) water shortage since April 3, 2026, following an order the Southwest Florida Water Management District passed on March 24, 2026 (City of Tampa, water use restrictions). Last verified: October 18, 2026, against the Southwest Florida Water Management District river pages, the City of Tampa Water Department and the Hillsborough County Wilderness Parks listing.

Two second-magnitude springs, Crystal Springs south of Zephyrhills and Sulphur Springs in Tampa, add water to the Hillsborough River (SWFWMD, springs).

The district adds that springs are not the major contributor to flow, because the Hillsborough River is primarily a blackwater river stained dark brown like tea (SWFWMD, ecology).

Crystal Springs discharges an average of 36 million gallons a day and matters most in the dry season. Sulphur Springs, ringed by concrete walls in an urban part of Tampa, averages 22 million gallons a day and has been closed for recreation since the mid-1980s because of high bacteria counts (SWFWMD, springs). Downtown, Ulele Springs was reconnected to the Hillsborough River in 2014, when an industrial-era pipe was removed and a winding stream and wetland were built by the district, the City of Tampa and the Ecosphere Restoration Institute; the spring is now part of Water Works Park.

The district lists Big Ditch, Flint Creek, the Tampa Bypass Canal, Indian Creek, New River, Two Hole Branch, Cypress Creek, Trout Creek and Lakes Thonotosassa, Hunter, Iola, Pasadena, King and Padgett among the tributaries (SWFWMD, tributaries). Lake Thonotosassa, the largest natural lake in Hillsborough County at more than 800 acres, drains to the river with poor water quality, so a 51-acre treatment marsh was finished in 1999 to clean creek water before it reaches the lake.

The brown color comes from decomposing plants in floodplain forest, cypress domes and pine flatwoods, and the swamp once held ancient cypress that logging removed in the 18th, 19th and early 20th centuries (SWFWMD, ecology). A wood stork rookery sits in the Lower Hillsborough Wilderness Preserve.

The Southwest Florida Water Management District adopted revised minimum flows and a recovery strategy for the Lower Hillsborough River in 2007, with a joint funding agreement with the City of Tampa written into the rule (SWFWMD, Lower Hillsborough River minimum flows).

Minimum flows are limits the district Governing Board sets so that withdrawals do not do significant harm, and Florida law requires a recovery strategy when flows fall below them. The first five-year evaluation of the Lower Hillsborough River strategy came out in 2015, the second went to the Governing Board in May 2020, and the third went to the board in January 2026 (SWFWMD).

The district reports that key ecological conditions in the river are being maintained, including low-salinity habitat downstream of the dam, and it posts consolidated daily flow data from USGS, the City of Tampa and the district for January 1, 1996, through December 31, 2023 (SWFWMD minimum flows page). The posted data end in 2023, so they do not cover the 2026 water shortage that Tampa has been under since April 3, 2026 (City of Tampa).

Floodwater is a separate system. The Harney Canal, which the district places north of the City of Tampa's dam by a few miles, links the Hillsborough River to the Tampa Bypass Canal, which carries high water around Tampa and Temple Terrace to McKay Bay (SWFWMD, Tampa Bypass Canal System). The district gives the canal as about 15.7 miles on its project page and 14 miles on its river education site (SWFWMD, tributaries); the Tampa Bypass Canal guide covers that system in full.

Hillsborough County's Sargeant Conservation Park on U.S. 301 provides boating access to the Hillsborough River State Canoe Trail (Hillsborough County, Wilderness Parks).

The park is one of the county's Wilderness Parks along U.S. 301 and Morris Bridge Road in Thonotosassa, all inside the Lower Hillsborough Wilderness Preserve, which takes in 13 miles of the river.

John B. Sargeant Conservation Park is at 12702 U.S. Hwy. 301 N. Morris Bridge Conservation Park, at 13630 Morris Bridge Rd., has a boat launch and a boardwalk through cypress, and Trout Creek Conservation Park, at 12550 Morris Bridge Rd., sits near the mouth of Trout Creek and is used for canoeing, kayaking and fishing (Hillsborough County). The county charges $2 per vehicle for up to eight people, a $5 boat launch fee and $25 for a canoe or kayak rental at the sites that offer them. Swimming is not allowed and dogs must be on a 6-foot leash.

Season changes the hours. Morris Bridge and Trout Creek open 7 a.m. to 8 p.m. in spring and summer and 7 a.m. to 6 p.m. in fall and winter, and John B. Sargeant keeps 8 a.m. to 7 p.m. on weekdays and 8 a.m. to 8 p.m. on weekends in spring and summer (Hillsborough County, Wilderness Parks). A paddler planning a winter trip on the Hillsborough River should count on a 6 p.m. close.

Farther upstream, Hillsborough River State Park covers 2,990 acres and is the place to see the river's Class II rapids (SWFWMD, recreation); the Hillsborough River State Park visitor guide lists its fees and closures. In Tampa itself, the restored Ulele Springs can be seen at the city's Water Works Park (SWFWMD, springs).

The Hillsborough River watershed has supported people for at least 10,000 years, and Archaic period settlements formed where the river meets Tampa Bay, according to the district (SWFWMD, human history).

Spanish expeditions under Panfilo de Narvaez in 1528 and Hernando de Soto 11 years later reached the area. In 1757 Don Francisco Maria Celi surveyed the Hillsborough River as far as present-day Temple Terrace looking for pine for ship masts, and a plaque at Riverhills Park marks the voyage (SWFWMD).

Fort Brooke went up at the river mouth in the 1820s. Tampa's only Civil War action came when federal troops burned two boats belonging to James McKay on the Hillsborough River near Lowry Park (SWFWMD, human history). The English name honors the Earl of Hillsborough; earlier names were the Mocoso River (Timucua), the Lockcha-Popka-Chiska (Seminole) and the River of San Julian de Arriaga (Spanish).