Colne Valley Viaduct

The viaduct will be 2.1 miles long and cross the Colne Valley Regional Park in Denham. It will pass over the Hillingdon Outdoor Activity Centre (HOAC), which will be relocated to Broadwater Lake, the Grand Union Canal, Savay Lake and Moorhall Road. It then crosses several lakes in the Broadwater Lake Reserve as well as the River Colne before crossing the A412 North Orbital Road. The route leaves the viaduct onto the newly constructed West Hyde Embankment on its way to the Chiltern Tunnel. Denham Water-ski Club has had to build a new clubhouse on the south side of the lake.

The Colne Valley Trail (part of the London Loop) will remain open apart from a short time when the section is constructed overhead. It will be temporarily diverted via a pontoon in the canal before being reinstated along its original route. The Grand Union Canal towpath will remain open throughout construction apart from a short time when the viaduct is constructed overhead. PRoW Den 3 (Old Shire Lane) will be diverted during construction and then reinstated under the viaduct.

There will be a number of construction compounds along the viaduct route. Access to these compounds will be via a temporary haul road which follows the route across the lakes on a series of jetties then on to the South Tunnel Portal compound and then the slip roads to the M25.

The viaduct will be supported by 56 piers and two abutments. The deck will consist of 1,000 sections made on site in the viaduct precast factory and put in place using a launching girder named Dominique. The viaduct deck is due to be completed by the end of 2024 with full completion by May 2025.

Looking south along the Colne Valley viaduct route – May 2021 (01_256)
Colne Valley viaduct looking north – Apr. 2016 (01_255)
Looking west across Harefield No.2 Lake – May 2024 (01_370)
Looking south towards the south abutment and the Harvil Road overbridge – Apr. 2024 (01_369)
Looking south across Harefield No,2 Lake towards the southern end of the viaduct and the remains of HOAC – May 2024 (01_368)
Looking south across Harefield No.2 Lake – May 2024 (01_367)
Looking south across Harefield No.2 Lake – May 2024 (01_366)
Looking west across Harefield No.2 Lake – Apr. 2024 (01_365)
Looking south across Harefield no.2 Lake – Apr. 2024 (01_364)
Viaduct pier in Harefield No.2 Lake – Apr. 2024 (01_363)
Looking east along the Grand Union Canal – Apr. 2024 (01_362)
Looking south along the viaduct across Harefield no. 2 Lake – Apr. 2024 (01_360)
Looking east along the Grand Union Canal towpath – Apr. 2024 (01_358)
Looking east along the Grand Union Canal towpath – Mar. 2024 (01_357)
Looking north across Denham Water-ski Club towards the viaduct crossing the A412 – Mar. 2024 (01_356)
Looking across Denham Water-ski Club towards the viaduct passing over the old clubhouse – Mar. 2024 (01_355)
Looking south across Harefield no.2 lake towards the southern end of the viaduct – Feb. 2024 (01_333)
Colne Valley viaduct looking north across Harefield no.2 lake – Mar. 2024 (01_354)
(340) Colne Valley viaduct looking south across Harefield no.2 lake – Mar. 2024 (01_353)
Looking north towards the launching girder on pier 19 – Mar. 2024 (01_352)
Launching girder between piers 19 and 20 across the Grand Union Canal – Mar. 2024 (01_351)
Transverse beam 2 being moved across the Grand Union Canal – Mar. 2024 (01_350)
Grand Union Canal looking east towards the viaduct crossing – Mar. 2024 (01_349)
Grand Union Canal looking south east towards pier 19 – Mar. 2024 (01_348)
Looking south across the Grand Union Canal towards pier 19 – Mar. 2024 (01_347)
Looking south across the Grand Union Canal towards pier 19 – Mar. 2024 (01_345)
Looking east towards the viaduct crossing Savay Lake and the Grand Union Canal – Mar. 2024 (01_344)
Looking west along the Grand Union Canal towards the viaduct crossing – Mar. 2024 (01_343)
Looking west along the Grand Union Canal from Moorhall Road towards the viaduct crossing – Mar. 2024 (01_342)
Looking south across Savay Lake towards the canal crossing – Mar. 2024 (01_341)
Looking north across the Grand Union Canal towards pier 20 – Mar. 2024 (01_340)
Looking along the viaduct south of the Moorhall Road crossing – Mar. 2024 (01_339)
Colne Valley Trail (London Loop) diversion around pier 19 – Mar. 2024 (01_337)
Colne Valley Trail passing pier 19 – Mar. 2024 (01_336)
Looking north across the Grand Union Canal towards pier 20 – Mar. 2024 (01_335)
Viaduct construction across Savay Lake – Mar. 2024 (01_334)
Pier construction across Harefield no. 2 Lake – Feb. 2024 (01_332)
Launching girder crossing Savay Lake – Feb, 2024 (01_331)
Colne Valley viaduct looking south – Jan. 2024 (01_328)
Colne Valley viaduct crossing Harefield No,2 Lake – Jan. 2024 (01_327)
Colne Valley viaduct crossing Savay Lake – Jan. 2024 (01_326)
Launching girder crossing Moorhall Road – Nov. 2023 (01_325)
Viaduct crossing Moorhall Road and Korda Lake – Nov. 2023 (02_324)
Looking west from Denham Water-ski Club towards the viaduct and the old clubhouse – Oct. 2023 (01_323)
Looking across Denham Water-ski Club towards the viaduct – Oct. 2023 (01_322)
Viaduct running north alongside the A412 North Orbital Road – Nov. 2023 (01_321)
Construction of piers 14 to 17 across Harefield no. 2 Lake – Oct. 2023 (01_320)
Construction of piers 20 to 22 across Savay Lake – Oct. 2023 (01_319)
Colne Valley viaduct crossing Moorhall Road – Oct. 2023 (01_318)
Viaduct launching girder crossing Korda Lake – Oct. 2023 (01_317)
Looking south across Moorhall Road towards pier construction across Savay Lake – Sep. 2023 (01_315)
Looking south across Korda Lake past pier 31 – Sept. 2023 (01_313)
Looking north past pier 32 towards the launching girder – Sept. 2023 (01_312)
Viaduct launching girder adding segments at pier 33 – Sept. 2023 (01_311)
Looking north along the viaduct past the Denham Water-ski Club – Sept. 2023 (01_310)
Looking south along the viaduct towards the original Denham Water-ski clubhouse – Sep. 2023 (01_309)
Looking south along the viaduct from the north abutment – Sep. 2023 (01_308)
Parapet construction at the viaduct north abutment – Sep. 2023 (01_307)
Viaduct pier construction on Harefield no. 2 Lake – Aug. 2023 (01_306)
Looking east along the Grand Union Canal under the viaduct route _ Aug. 2023 (01_305)
Looking north across the Grand Union Canal – Aug. 2023 (01_304)
Viaduct pier construction across Savay Lake – Aug. 2023 (01_303)
Moorhall Road closure for construction of viaduct section across the road – Aug. 2023 (01_302)
Looking west along Moorhall Road towards the viaduct crossing – Aug. 2023 (01_301)
Viaduct construction across Korda Lake – Jul. 2023 (01_298)
Colne Valley viaduct crossing Moorhall Road – Aug. 2023 (01_297)
Looking north towards the North Orbital Road crossing – Jul. 2023 (01_295)
Constructing viaduct piers across Korda Lake – Jun. 2023 (01_292)
Constructing viaduct piers across Korda Lake – Jun. 2023 (01_291)
Viaduct launching girder crossing the river Colne – Jun. 2023 (01_290)
Colne Valley viaduct looking north along the North orbital Road – Mar. 2023 (01_289)
Colne Valley viaduct section completed – Mar. 2023 (02_288)
The original and the new Denham Water-ski Clubhouses – Mar. 2023 (01_287)
Looking west along the North Orbital Road towards the Colne Valley viaduct – Feb. 2023 (01_286)
Colne Valley viaduct crossing the North Orbital Road – Feb. 2023 (01_285)
Colne Valley viaduct from Denham Water-ski Club – Feb. 2023 (01_284)
Colne Valley viaduct from Denham Water-ski Club – Feb. 2023 (01_283)
Colne Valley viaduct showing the original clubhouse – Feb. 2022 (01_282)
Preparing for the installation of the next pier head sections – Feb. 2023 (01_280)
140 tonne section lifted into place – Feb. 2023 (01_279)
140 tonne section moving into place – Feb. 2023 (01_278)
140 tonne section lowering into place – Feb. 2023 (01_277)
Looking east towards a temporary pipeline crossing the Grand Union Canal – Dec. 2022 (01_275)
Pier construction across Savay Lake looking north – Dec. 2022 (01_274)
Pier construction across Korda Lake – Dec. 2022 (01_272)
Colne Valley viaduct looking east – Nov. 2022 (01_271)
Colne Valley viaduct deck installation – Dec. 2022 (01_268)
A412 North Orbital Road looking north – Nov. 2022 (01_267)
A412 North Orbital Road north – Nov. 2022 (01_265)
A412 Colne Valley viaduct – Nov. 2022 (01_264)
A412 Colne Valley viaduct – Nov. 2022 (01_262)
A412 looking north – Nov. 2022 (01_261)
Looking east across the viaduct and the Denham Water Ski Club – Oct. 2022 (01_260)
Looking north towards the south tunnel portal – Oct. 2022 (01_259)
Looking north along the A412 North Orbital Road – Oct. 2022 (01_258)
Viaduct crossing the North Orbital Road looking west – Sep. 2022 (01_294)
Viaduct crossing the North Orbital Road – Sep. 2022 (01_293)
Viaduct crossing the North Orbital Road – Sep. 2022 (01_291)
Rotary piling for the viaduct piers in Harefield No.2 Lake – Aug. 2022 (01_289)
Colne Valley Trail diversion looking north – Aug. 2022 (01_288)
Looking north across the Grand Union Canal – Aug. 2022 (01_287)
Looking south across the Grand Union Canal – Aug. 2022 (01_286)
Colne Valley Trail diversion looking north – Aug. 2022 (01_285)
Colne Valley Trail diversion looking north – Aug. 2022 (01_284)
Looking south along the viaduct route across the Grand Union Canal – Aug. 2022 (01_282)
Looking east along the Grand Union Canal towpath – Aug. 2022 (01_281)
Looking west along Grand Union Canal towpath – Jul. 2022 (01_271)
Looking south across Grand Union Canal towards pontoon carrying diverted footpath bridleway – Jul. 2022 (01_270)
Pontoon carrying footpath diversion – Jul. 2022 (01_273)
Construction of piers 19 and 20 in Savay Lake – Jul. 2022 (01_268)
North Orbital Road (A412) looking east – Jul. 2022 (01_276)
Viaduct launching girder looking north – Jul. 2022 (01_275)
Looking south across the Grand Union Canal – Jun. 2022 (01_264)
Looking east along the Grand Union Canal towpath – Jun. 2022 (01_263)
Looking east across the North Orbital Road crossing – Jun. 2022 (01_261)
Looking north towards the viaduct launch girder – Jun. (01_260)
Looking north towards the viaduct launch girder – Jun. 2022 (01_259)
Looking west towards the viaduct launch girder between pier 56 and the north abutment- Jun. 2022 (01_257)
Colne Valley Viaduct looking north towards A412 crossing – Apr. 2022 (01_254)
Viaduct launching girder – Apr. 2022 (01_253)
Looking south across Harefield no2. Lake from the Colne Valley Trail – Mar. 2022 (01_250)
Looking east towards the end of the haul road from the Grand Union Canal towpath – Jan. 2022 (01_249)
Looking towards the jetty across Harefield no.2 Lake – Mar. 2022 (01_248)
Sheet piling for pier 20 – Mar. 2022 (01_247)
Looking south across Savay Lake – Mar. 2022 (01_246)
Rotary & sheet piling for pier 21 – Mar. 2022 (01_245)
Looking north across Korda Lake – Mar. 2022 (01_244)
Looking south towards Moorhall Road crossing – Mar. 2022 (01_243)
River Colne diversion looking south – Mar. 2022 (01_242)
River Colne diversion looking east – Mar. 2022 (01_241)
Rotary piling for viaduct pier – Mar. 2022 (01_240)
Viaduct support pier 55 – Mar. 2022 (01_239)
Pier 56 and north abutment – Mar. 2022 (01_238)
Viaduct launching girder – Mar. 2022 (01_237)
Colne Valley viaduct haul road looking south – Nov. 2021 (01_204)
Piling for a viaduct support pier in Savay Lake – Jan. 2022 (01_231)
Old Shire Lane ancient footpath looking north towards the West Hyde embankment – Jan. 2022 (01_227)
Looking east along the Grand Union Canal past the Colne Valley viaduct crossing – Dec. 2021 (01_221)
Looking north across Savay Lake – Jan. 2022 (01_230)
Jetty piling & deck installation on Savay Lake – Jan. 2022 (01_229)
Haul road on jetty across Savay Lake – Jan. 2022 (01_228)
Base of Colne Valley viaduct pier 54 – Dec. 2021 (01_215)
Construction of Colne Valley viaduct pier 55 – Dec. 2021 (01_214)
Looking north towards the start of the West Hyde embankment – Dec. 2021 (01_213)
Grand Union Canal looking south towards Harefield no.2 lake and the south embankment – Nov. 2021 (01_208)
Jetty piling & deck installation – Nov. 2021 (01_206)
(181) Sheet piling for pier coffer dams – Nov. 2021 (01_205)
Colne Valley viaduct crossing the A412 – Nov. 2021 (01_203)
Construction of the third viaduct support pier – Nov. 2021 (01_201)
Construction of the second viaduct support pier – Nov. 2021 (01_200)
Looking towards the south end of the Colne Valley viaduct from the Colne Valley Trail – Aug. 2021 (01_195)
Looking towards the south end of the Colne Valley viaduct from the Colne Valley Trail – Aug. 2021 (01_194)
Grand Union Canal looking north across Savay Lake – Aug. 2021 (01_192)
Moorhall Road looking west across the viaduct crossing – Aug. 2021 (01_191)
Moorhall Road looking north along the temporary haul road – Aug. 2021 (01_189)
A412 looking east towards the viaduct crossing – Aug. 2021 (01_187)
Looking south along the viaduct haul road from the A412 – Aug. 2021 (01_186)
Looking north along the viaduct route from the A412 – Aug. 2021 (01_185)
Colne Valley viaduct – construction of the third support pier – Aug. 2021 (01_183)
Colne Valley viaduct looking north towards the West Hyde embankment – Aug. 2021 (01_182)
Colne valley viaduct looking south – Jul. 2021 (01_175)
Colne valley viaduct crossing the A412 looking west – Jul. 2021 (01_173)
Looking south towards the Colne Valley viaduct – Jul. 2021 (01_172)
Looking west along the Grand Union Canal past Harefield Marina – May 2021 (01_166)
Grand Union Canal looking west – May 2021 (01_165)
Grand Union Canal looking east – May 2021 (01_164)
Looking north across Savay Lake – May 2021 (01_163)
Moorhall Road looking west – May 2021 (01_161)
Moorhall Road looking east – May 2021 (01_156)
Looking south across the A412 – May 2021 (01_155)
Looking north along the Colne Valley viaduct – May 2021 (01_154)
Denham Water-ski Club looking west towards the viaduct route – Apr. 2021 (01_150)
Denham Water-ski Club looking north – Apr. 2021 (01_148)
A412 North Orbital Road looking east – Mar. 2021 (01_143)
Looking north along the viaduct route from Denham water-ski club – Mar. 2021 (01_142)
A412 North Orbital Road looking east – Mar. 2021 (01_141)
Old Shire Lane diversion looking east – Mar. 2021 (01_140)
Looking south along the viaduct crossing over the A412 – Mar. 2021 (01_137)
Looking north along the viaduct route from Denham the A412 – Mar. 2021 (01_136)
Old Shire Lane (PRoW Den 2_1) closed for the construction of the viaduct – Mar. 2021 (01_133)
PRoW Wen 6/3 looking north – Mar. 2021 (21_44)
Looking north along the viaduct route across Moorhall Road – Feb. 2021 (01_125)
Looking north along the viaduct route across Korda Lake – Feb. 2021 (01_124)
Looking north along the viaduct route across the A412 – Feb. 2021 (01_122)
Old Shire Lane footpath diversion along the A412 looking west – Feb. 2021 (01_121)
Looking north from the A412 towards the North Launch Satellite Compound – Feb, 2021 (01_118)
Colne Valley Viaduct North Launch Satellite Compound offices and welfare unit – Feb. 2021 (01_117)
Grand Union Canal looking west from Moorhall Road – May 2020 (01_113)
Grand Union Canal looking west – May 2020 (01_112)
Grand Union Canal looking south along the viaduct route – Jan. 2021 (01_111)
Grand Union Canal looking north across Savay Lake – Jan. 2021 (01_109)
Grand Union Canal looking east – Jan. 2021 (01_108)
Moorhall Road looking east across the viaduct route – Jan. 2021 (01_107)
Looking north across Moorhall Road – Jan. 2021 (01_106)
Looking north from Moorhall Road towards Korda Lake – Jan. 2021 (01_104)
Moorhall Road looking east – Jan. 2021 (01_103)
Looking north along the A412 past Denham Water-Ski Club – Jan. 2021 (01_102)
Looking south along the viaduct route from Denham Water-Ski Club – Jan. 2021 (01_101)
Denham Water-Ski Club looking east – Jan. 2021 (01_100)
Colne Valley viaduct looking north from the Denham water-ski club – Dec. 2020 (01_94)
A412 looking east where the viaduct crosses – Dec. 2020 (01_93)
Colne Valley viaduct looking north from the A412 – Dec. 2020 (01_91)
PRoW Den3/1 (Old Shire Lane) temporarily closed – Dec. 2020 (01_89)
Colne Valley Viaduct looking north – Oct. 2020 (01_84)
Denham Water Ski Club looking south – Oct. 2020 (01_82)
Denham Water Ski Club looking north – Sep. 2020 (01_81)
Colne Valley viaduct looking north – Sep. 2020 (01_79)
Looking north across the viaduct route as it crosses Old Shire Lane – Aug. 2020 (01_72)
Looking south along the Colne Valley Viaduct from Old Shire Lane – Aug. 2020 (01_71)
Looking south along the Colne Valley Viaduct from Old Shire Lane – Aug. 2020 (01_69)
Colne Alley Viaduct looking across the route from the A412 – Aug. 2020 – (01_65)
Colne Valley Viaduct looking south from Denham Water-Ski Club – Aug. 2020 (01_64)
Colne Valley Viaduct looking north from Denham Water-Ski club – Aug. 2020 (01_63)
A412 looking west – Aug. 2020 (01_62)
Colne Valley Viaduct looking south from the A412 – Aug. 2020 (01_61)
Colne Valley Viaduct looking north across the A412 – Aug. 2020 (01_60)
Old Shire Lane looking north across the route – Aug. 2020 (01_59)
Old Shire Lane looking south across the route – Aug. 2020 (01_58)
Looking south towards the viaduct from Tilehouse Lane – Aug. 2020 (01_57)
Looking towards the Denham Water Ski Club entrance off the A412 – Aug. 2020 (01_52)
Looking south from the A412 where the viaduct crosses the Denham Water Ski-Club – Aug. 2020 (01_51)
Looking east where the viaduct crosses the A412 – Aug. 2020 (01_50)
Looking south along the viaduct route where it crosses the A412 – Aug. 2020 (01_49)
Looking west where the viaduct crosses the A412 – Aug. 2020 (01_47)
Looking east where the viaduct crosses the A412 – Aug. 2020 (01_46)
Looking north where the viaduct crosses the A412 – Aug. 2020 (01_45)
Old Shire Lane looking south towards the route – Aug. 2020 (01_44)
Looking south from Old-Shire Lane across the Colne Valley Viaduct satellite compound – Aug. 2020 (01_43)
Looking south from Old Shire Lane along the route of the viaduct – Aug. 2020 (01_42)
Looking north from Old Shire Lane towards the Tilehouse Lane cutting – Aug. 2020 (01_41)
Tilehouse Lane looking south towards the viaduct – Aug. 2020 (01_39)
A412 North Orbital Road looking west – Jul. 2020 (01_37)
A412 North Orbital Road looking east – Jul. 2020 (01_36)
PRoW Den3 Old Shire Lane from the A412 – Jul. 2020 (01_35)
Old Shire Lane from the A412 – Jul. 2020 (01_34)
Old Shire Lane looking north across the route – Jul. 2020 (01_33)
Old Shire Lane looking south across the route – Jul. 2020 (01_32)
Old Shire Lane looking south across the route – Jul. 2020 (01_31)
Old Shire Lane looking south across the route – Jul. 2020 (01_30)
Old Shire Lane looking north along the route – Jul. 2020 (01_29)
Pile Test Site – Nov. 2019 (01_27)
Pile Test Site – Nov. 2019 (01_26)
Pile Test Site – Nov. 2011 (01_25)
Colne Valley Viaduct – Apr. 2016 (01_24)