| 1845 | Ramsey | North Pier 550ft in extent at this date |
| 1845 | Ramsey | South Pier Lighthouse erected 28ft above HW, 4 miles visibility. Dark stone tower. Length of Pier 400 ft |
| 1845 | Peel | Harbour deepened by 3 ft. Pier foundation planked. Cost £1,041 |
| 1848 | Port St Mary | New Quay (West) built cost £391 |
| 1848 | Bahama Bank | Light vessel established in 11 fathoms 38ft above HW |
| 1849 | Castletown | Pier extended 30 yds |
| 1849 | Castletown | Pier Head light established (Red) 32ft above HW. Visibility 8 miles |
| 1849 | Douglas | Bulwark rebuilt |
| 1849 | Ramsey | 103 yds. New quay built extending towards Bridge. |
| 1850 | Fort Island | Light established (Aug 12th – Oct 10th annual & 50ft above HW 6 miles |
| 1853 | Douglas | 20,000 gravel removed from harbour (1843-53) |
| 1856 | Peel | 200 ft of West Quay built before this date |
| 1859 | Douglas | Douglas Head Light transferred 01/08/1859 |
| 1861 | Peel | New Lighthouse on Pier Head |
| 1862 | Douglas | Abernethy breakwater commenced |
| 1863 | Peel | Abernethy breakwater foundation stone laid by Governor och |
| 1863 | Port Erin | Breakwater commenced |
| 1864 | Douglas | Abernethy breakwater partly destroyed (Jan/Feb) |
| 1865 | Peel | Breakwater light established 32 ft above HW |
| 1867 | Douglas | Breakwater totally destroyed |
| 1867 | Douglas | Victoria Pier Commenced |
| 1868 | Ramsey | Abernethy Breakwater completed and lighthouse established 34 ft above HW |
| 1869 | Douglas | Iron Pier at Broadway opened in August |
| 1869-70 | Ramsey | West Quay built |
| 1869 | Chicken Rock | Lighthouse foundations D&T Stevenson |
| 1870 | Peel | Encasing of Abernethy Breakwater commenced |
| 1872 | Douglas | Victoria Pier opened by Lord Loch |
| 1874 | Chicken Rock | Light established. Tower 143 ft high 122 ft above HW 16 miles |
| 1874 | | Harbour Dues re-imposed |
| 1874-6 | Ramsey | South breakwater built 510 ft |
| 1875 | Peel | Encasing of breakwater completed |
| 1875 | Chicken Rock | Ligh exhibited – 1st January |
| 1875 | Calf of Man | Lights extinguished 1st January |
| 1876 | Ramsey | South Breakwater timber staging erected |
| 1876 | Port Erin | Breakwater completed |
| 1877 | Ramsey | East Quay wall commenced (June) at harbour office |
| 1878 | Ramsey | East Quay wall completed in November 765 ft |
| 1879 | Douglas | Battery Pier completed cost £110,000 |
| 1880 | Langness | Light established 63ft high 76 ft above HW |
| 1881 | Port Erin | Breakwater destroyed |
| 1881-2 | Peel | West quay built |
| 1882 | Port St Mary | Alfred Pier foundation stone laid by Duke of Edinburgh 31/1/1882 |
| 1883 | Ramsey | Queen’s Pier commenced |
| 1883 | Fort Island | Light discontinued |
| 1884 | Port Erin | Fixed red lead-in lights 130 ft apart established on East Shore |
| 1884 | Port St Mary | Fixed green light on extremity of finished portion of Alfred Pier |
| 1884 | Port Erin | Black Buoy placed at end of breakwater ruins |
| 1884 | Peel | Causeway and approach to breakwater built |
| 1885 | Peel | Harbour wall of breakwater built and deck surfaced |
| 1886 | Port St Mary | Alfred Pier completed |
| 1886 | Ramsey | Queen’s Pier opened 22/7/1886 |
| 1886 | Castletown | Swing Bridge built (patent shaft and Axletree Ltd) £1,000 |
| 1887 | Douglas | Victoria Pier extension commenced |
| 1890 | Laxey | Harbour acquired by Isle of Man Harbour Commissioners |
| 1890 | Douglas | Victoria Pier Buildings erected cost £6,900 |
| 1892 | Douglas | Head Lighthouse re-built |
| 1892 | Ramsey | Swing Bridge built by Cleveland engineering Company cost £20,325 |
| 1892 | Port St Mary | Alfred Pier extension commenced |
| 1892 | Peel | Breakwater extension commenced |
| c1892 | Douglas | Broadway Iron Pier demolished and re-erected at Colwyn Bay |
| 1894 | Douglas | Swing Bridge contract (Sir W G Armstrong Mitchell £6,590) |
| 1894 | Douglas | Victoria Pier extension completed |
| 1896 | Peel | Breakwater extension completed |
| 1900 | Ramsey | Queen’s Pier extension completed |
| 1903 | Castletown | Footbridge. Handyside & Co cost £414. |
| 1906 | Douglas | Callie Stage built |
| 1912 | Port Erin | Raglan Pier built |
| 1936 | Douglas | Edward Pier built |
