Looking at GSV, I see that water levels are very close to the roadway in several locations
Example #1:https://www.google.com/maps/@30.6765522,-87.9769515,3a,15y,343.05h,77.91t/data=!3m7!1e1!3m5!1sBltnQMLrPTxDes5Xf-RvRw!2e0!6s%2F%2Fgeo0.ggpht.com%2Fcbk%3Fpanoid%3DBltnQMLrPTxDes5Xf-RvRw%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D307.50107%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192 (https://www.google.com/maps/@30.6765522,-87.9769515,3a,15y,343.05h,77.91t/data=!3m7!1e1!3m5!1sBltnQMLrPTxDes5Xf-RvRw!2e0!6s%2F%2Fgeo0.ggpht.com%2Fcbk%3Fpanoid%3DBltnQMLrPTxDes5Xf-RvRw%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D307.50107%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192)
Example #2: Water unable to drain: https://www.google.com/maps/@30.6769002,-87.9838781,3a,16.6y,101.57h,91.48t/data=!3m6!1e1!3m4!1s_XVstninl_NtC8p7-iIMkw!2e0!7i16384!8i8192 (https://www.google.com/maps/@30.6769002,-87.9838781,3a,16.6y,101.57h,91.48t/data=!3m6!1e1!3m4!1s_XVstninl_NtC8p7-iIMkw!2e0!7i16384!8i8192)
Example #3: This is the EB I-10 exit ramp to US 90/98:https://www.google.com/maps/@30.6788895,-87.9898619,3a,40.1y,347h,81.19t/data=!3m7!1e1!3m5!1sIL_eZlL0ZilEQWkfRfOtEg!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3DIL_eZlL0ZilEQWkfRfOtEg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D57.866383%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192 (https://www.google.com/maps/@30.6788895,-87.9898619,3a,40.1y,347h,81.19t/data=!3m7!1e1!3m5!1sIL_eZlL0ZilEQWkfRfOtEg!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3DIL_eZlL0ZilEQWkfRfOtEg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D57.866383%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192)
Same area: https://www.google.com/maps/@30.6775273,-87.9883621,3a,15y,308.49h,88.23t/data=!3m7!1e1!3m5!1spStbEsOlaqaLCGcO4paKLQ!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3DpStbEsOlaqaLCGcO4paKLQ%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D343.86887%26pitch%3D0%26thumbfov%3D100!7i13312!8i6656 (https://www.google.com/maps/@30.6775273,-87.9883621,3a,15y,308.49h,88.23t/data=!3m7!1e1!3m5!1spStbEsOlaqaLCGcO4paKLQ!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3DpStbEsOlaqaLCGcO4paKLQ%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D343.86887%26pitch%3D0%26thumbfov%3D100!7i13312!8i6656)
Wasn't the shallow grade of US 90/98 over the water the reason I-10 was built on a viaduct structure long ago? I can say from personal pbservations that US 90/98 has been like that for at least since the 1980s.
"Rising seas".
Quote from: Max Rockatansky on December 29, 2019, 08:54:31 PM
Wasn't the shallow grade of US 90/98 over the water the reason I-10 was built on a viaduct structure long ago? I can say from personal pbservations that US 90/98 has been like that for at least since the 1980s.
It seems crazy to me that they would build the highway that close to water level. According to sealevelrise.org, seas around Alabama have risen up to 11" since 1966, and that this is mostly due to subsidence. The standing water that is not draining is a tell-tale sign that the water level is higher than when the roadway was built
Wasn't Battleship Parkway built in the 1920s? Back in that era paved highways were just becoming a regular thing. I would imagine had it been built even three-four decades later the standards would have been infinitely higher.
Has USGS changed the published vertical navigational clearances on this bridge?
Small craft helmsmen need to be advised.
Quote from: Max Rockatansky on December 29, 2019, 09:28:49 PM
Wasn't Battleship Parkway built in the 1920s? Back in that era paved highways were just becoming a regular thing. I would imagine had it been built even three-four decades later the standards would have been infinitely higher.
I don't know. I don't have much knowledge of Alabama roads. Historic Aerials shows it being a two-lane road in 1952, upgraded to four-lane by 1967. To me, it would have been logical to raise the roadway when it was widened