March 16th – Deering Ladder Co. 1 was renumbered as PFD Ladder 4, as Portland already had Ladders 1, 2, and 3.  Deering’s Spring Street was renamed Woodfords Street and the firehouse as #165.

Portland’s Chief Engineer, Melville N. Eldridge, thought their ladder carriage was too light for fire duty and donated it to the City of South Portland.  A spare 1874 Hunneman ladder carriage (old PFD L-1) was rebuilt for Ladder 4, carrying 300 feet of ladders.  The firehouse was remodeled for permanent men and four horses, which were purchased for Ladder 4 and Hose 8.

September 11, 1899 – Alvah G. Eldridge was appointed a Permanent Driver for Ladder 4.

June 1, 1906 - A Permanent Ladderman was appointed, giving Ladder 4 two Permanent Men.

April 8, 1907 – The roof of the Woodford Street firehouse caught fire from sparks from a passing railroad train.  Because of extensive damage to the building, Ladder Co. 4 relocated to Engine Co. 9’s three-bay, two & ½-story brick Arbor Street firehouse at Morrill's Corner, which opened in 1903.    

September 4, 1915 – Ladder 4 was responding to a shed fire at 100 Revere Street with Engine 8, when 

The wheels caught in the trolley tracks on Stevens Avenue, near Pleasant Avenue in Central Square (Deering Center).  Ladderman Ralph E. Smith, a Permanent Relief Man at the Arbor Street firehouse, was thrown from atop the ladder carriage, falling between the horses and wheels, which ran over him.  He was taken to St. Barnabas Hospital on Woodford Street where he died.

1919 – Ladder 4 was reassigned L-1’s 1885 Talbot & Moulton truck, replacing the Hunneman. 

November 7, 1922 – Ladder Co. 4 was motorized with a new American LaFrance ladder & chemical combination truck.  A Permanent Captain, Lieutenant, and Ladderman were appointed, giving the The Company five Permanent Men and 3 Call Men.

November 22, 1926 – Ladder 4 became a permanent company, as Call Men Alfred Southworth,

Gilman Martin and George Mitchell were transferred to E-9.

May 8, 1945 – Ladder 4’s first aerial ladder truck (Seagrave 65 ft.) arrived and  went into service.

March 5, 1951 – Two-way radio installed in Ladder 4 by the fire alarm division. 

December 1, 1971 – Ladder 4 was reassigned a 1957 Seagrave 75-foot aerial ladder truck (old L-1).   

April 21, 1972 – Ladder 4 relocated to Engine 8’s two-bay, one-story brick North Deering station at 386 Allen Avenue, built in 1967.

April 25, 1978 – Ladder 4 was assigned a 1977 American LaFrance 100 ft. rear mounted ladder truck.

February 11, 1980 – Ladder 4 was reassigned L-1’s 1970 American LaFrance 80 ft. aerial tower.   

January 28, 1981 – Ladder Co. 4 was decommissioned because of budget problems, low staffing levels, and unfilled positions caused by retirements.

January 20, 2001 – Ladder Co. 4 was re-commissioned as a Quint Company, with the arrival of a new 2000 Pierce 1,500gpm quint truck, with a 105-foot aerial ladder.  It was staffed from the crew of Engine 8’s Quint, which was decommissioned.

September 24, 2017 – While Ladder 4 was on a run, a fire occurred in their firehouse kitchen and badly damaged the firehouse.  Ladder Co. 4 was relocated to Engine 9 on Forest Avenue in Riverton and Medcu 4 moved in with Engine 11 in East Deering.  Shortly after, renovation construction began.

May 8, 2019 – Ladder 4 and Medcu 4 moved back to their renovated firehouse on Allen Avenue.

August 20, 2020 – Ladder 4 returned from Pierce factory, after being rebuilt since 2018.