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Gross Dam Raise Tops Out at 470 Feet
CONFIRMED86% CONFIDENCE112 days agoHappened as dated, per the source[1]: "workers placed the final load of roller-compacted concrete on the top of the dam, bringing Gross Dam to a height of 470 feet."Denver Water finished raising Colorado's Gross Dam by 131 feet, topping out the concrete work that will nearly triple the reservoir's storage capacity.0.59Hama Hama Oyster Saloon Opens on Hood Canal
Hama Hama Oyster Saloon, 35846, US 101, Hamma Hamma, Mason County, Washington, 98555, United StatesHama Hama Oyster Company
ESTIMATED75% CONFIDENCE12.4 years agoThe New York Times' Restaurant List 2026 (15 September 2026) gives the opening only as April 2014, with no day. The pin sits on the last day of that month by this vertical's month-only convention, so the real opening day may be earlier in the month.[1]The Robbins family's five-generation oyster farm opens an open-air saloon on the western shore of Hood Canal, serving oysters pulled from the water in view.0.59Hoover Dam Dedicated by President Roosevelt
CONFIRMED85% CONFIDENCE91.0 years agoHappened as dated, per the source[1]: "President Franklin D. Roosevelt dedicates dam September 30th."President Franklin D. Roosevelt dedicated the Hoover Dam on the Colorado River, then the largest concrete structure ever built.0.58London's Thames Tideway 'Super Sewer' Officially Opens
CONFIRMED89% CONFIDENCE1.4 years agoHappened as dated, per the source[1]: "King Charles III officially opened the Thames Tideway[3] Tunnel on May 7, 2025."King Charles III officially opened the Thames Tideway Tunnel, a 25km deep sewer built to stop billions of litres of sewage overflowing into the Thames each year.$5B0.57Major Construction Begins on the New Long Bridge Over the Potomac
CONFIRMED90% CONFIDENCE254 days agoVPRA's notice says the work windows "begin January 12, 2026, and will continue until the project's completion in 2030".[1]The Virginia Passenger Rail Authority moved the Long Bridge Project into full construction, opening daytime work windows through the Washington, D.C. construction zone because the District's noise and vibration rules bar the work at night. A new two-track bridge beside the century-old Long Bridge will give a continuous four-track corridor between Arlington and L'Enfant Plaza, relieving the worst passenger-rail bottleneck on the East Coast.0.57New York Harbor Storm Surge Plan
ESTIMATED67% CONFIDENCEin 18.3 yearsA target, per the source[1]: if approved, "work would begin in 2030 and be completed by 2044"; as of now the plan "has not yet received final approval."The US Army Corps of Engineers is advancing a $52.6BN plan of storm-surge gates, sea walls and levees around New York Harbor, after shelving a more radical $119BN 'mega sea wall' spanning the harbor mouth.$52.6B0.57McCook Reservoir's Second Stage Delayed to 2032
DELAYED3 years late69% CONFIDENCEin 6.3 yearsDelayed from the original 2029 deadline, per the source[1]: "the current estimate for McCook Stage 2 going online is now Dec. 31, 2032."The next phase of Chicago's giant Deep Tunnel flood-control reservoir has slipped three years behind its original federal deadline because of a local stone shortage.0.57Austerlitz Basin Opens to Clean Up the Seine for the Olympics
CONFIRMED89% CONFIDENCE2.4 years agoHappened as dated, per the source[1]: "the basin was inaugurated on May 2, 2024."Paris inaugurated the Austerlitz basin, a giant underground stormwater tank built to stop sewage overflow into the Seine in time for Olympic swimming events.$1.5B0.57Hampton Roads Bridge-Tunnel Expansion
SCHEDULED83% CONFIDENCEin 338 daysGiven as scheduled, per VDOT and the source[1]: "the revised project schedule sets... a final completion date for August 27, 2027."Virginia is expanding the world's first bridge-tunnel, adding new tubes and widened approaches at Naval Station Norfolk, the largest naval base on Earth, more than 50 years after it first opened.$4B0.57The Washington Monument Opens to the Public
CONFIRMED84% CONFIDENCE138.0 years agoHappened as dated, per the source[1]: "opened to the public in Washington, D.C., on this day in history, Oct. 9, 1888".After decades of stalled funding and a visible change in stone partway up its shaft, the Washington Monument finally opened its doors to visitors in 1888.0.56The Brooklyn Bridge Opens
Brooklyn Bridge, New York, NY, USA
CONFIRMED82% CONFIDENCE143.3 years agoHappened as dated, per the source[1]: "Brooklyn Bridge opens | May 24, 1883".New York's Brooklyn Bridge opened to the public, completing a 13-year construction effort that Emily Warren Roebling steered to completion after her husband was incapacitated by decompression sickness.0.56City of Paris Opens Its Sewers to Public Tours During the 1867 World's Fair
ESTIMATED73% CONFIDENCE159.5 years agoThe Paris[3] sewer museum's own history page states tours "began in 1867, during the World's Fair" without naming an exact day, so the pin uses the Fair's opening date.During the 1867 Exposition Universelle, Paris opened Baron Haussmann's newly rebuilt sewer network to public tours for the first time, turning Eugène Belgrand's engineering into a civic showcase.0.56
United States Bureau of Reclamation
