A steady stream of last-minute voters were making their way to the ballot drop-off box outside Bainbridge Island Fire Department’s Station 21 on Madison Avenue just after 5:30 p.m. Tuesday.

Ballots must be dropped off or mailed before 8 p.m. Tuesday.

In the 2015 General Election, islanders will vote on Prop. 1 — a $15 million bond measure to pay for a new municipal courthouse/police station just north of city hall — and also cast votes on contested races for the Bainbridge city council, school board and park district board of commissioners.

Though three seats are open on the Bainbridge council, just one race features two candidates. Political newcomers Ron Peltier and Pegeen Mulhern are both seeking the council’s at-large, District 1 seat.

Incumbent Mike Scott is running unopposed for the Central Ward, District 4 seat. Kol Medina is also running unopposed for the North Ward, District 2 position after Councilwoman Anne Blair declined to seek another term.

There are two contested races for a Bainbridge school board seat.

Lynn Smith and Duncan Macfarlane are running for the District 1 board position, now held by Board Member Patty Fielding, a two-term school board director who decided against running a third time.

Incumbent District 4 Board Member Tim Kinkead is seeking another term and faces a challenge from Renard E. Burnett Sr.

Mev Hoberg, the school board’s District 3 director, is running unopposed. She was first appointed to the board in 2012 and was elected to her position in November 2013.

Voters will also pick a commissioner for the Bainbridge Island Metropolitan Park & Recreation District 2 seat.

Longtime incumbent Commissioner Ken DeWitt is seeking another term against challenger John Grinter.

Commissioner Jay Kinney is also seeking reelection to his Position 4 seat and is running unopposed.

Other candidates on the ballot who are running unopposed include Bainbridge Island Fire Commissioner Scott Isenman (Position 1) and Timothy S. Carey, who is running for the Position 5 seat on the fire board.

Commissioner Teri Dettmer, the Position 5 incumbent, decided against another run for the seat.

Also on the Bainbridge ballot: two sewer district items.

Kitsap Public Utility District 1 is hoping to get into the sewage treatment business, and Prop. 1, if approved, will allow KPUD 1 to buy, build, operate and maintain sewage systems.

KPUD officials have said that if the measure is approved, the district will explore the installation of membrane bio-reactor wastewater treatment plants as an alternative to traditional sewage treatment plants or septic systems. The smaller bio-reactor systems will send treated water back into the earth, and eventually, aquifers, rather than discharging treated wastewater into Puget Sound or Hood Canal.

KPUD 1 now serves water customers on Bainbridge and the Kitsap Peninsula. On Bainbridge, KPUD 1 operates the South Bainbridge, Island Utility, North Bainbridge and Harborcrest water systems.

Residents within the boundary of Sewer District 7 will also choose a commissioner for the board’s District 3 seat.

Commissioner Sarah Lee, who has been on the board since 1991, is seeking another term. She is being challenged by Mary Victoria Dombrowski.

The first results in the General Election are expected to be released by the Kitsap County Elections Division at 8:15 p.m. Election Night.