Underwater Topography

fltsimguy · 09-20-2010, 12:11 PM

Aside from the depth contours on Bizer maps, has anyone ever seen a map of the underwater topography of the Lake? I've always wondered what it looks like down there.

Mike

NHKathy · 09-20-2010, 01:12 PM

I have always wondered the same thing! I would love to see a map showing the bottom of the lake, minus the water....

MikeF-NH · 09-20-2010, 02:00 PM

other than Bizer, the last two versions of the Navionics chips provide very detained mapping of the bottom. The lastest version is accurate to like 5 ft. This chip will run in any Navionics compatible GPS.

Rattlesnake Gal · 09-20-2010, 02:46 PM

This sample of my Navionics map seems to be a bit more detailed for underwater topography.

I did a little investigating when I spotted that they named some of the under water mountains in the lake. The person I contacted at Navionics was sure that USGS was the one to name these features. This is the response that USGS sent back:

Underwater features generally are not shown on USGS topographic maps. I took a look at the USGS Geographic Names Information System (GNIS) database at U.S. Board on Geographic Names and found no features by those names listed in New Hampshire.

I am forwarding your inquiry to the GNIS Manager, for further response.

(I have not pursued the issue any further.)

fltsimguy · 09-20-2010, 03:50 PM

That's a pretty cool graphic! The one area of the lake I was particularly interested in was The Broads. I've always been curious why the depth goes from 180'+ to 30' so quickly. Thanks for sharing!

jrc · 09-20-2010, 06:18 PM

I have a pretty good feeling that Bizer knows where those names came from.

Rattlesnake Guy · 09-21-2010, 10:11 PM

The map that RG scanned above is available at

KBoater · 09-22-2010, 10:39 AM

RG great map. Is there a set of the lake? I'm interested in the enterance to Winter Harbor. Everytime I drive thru there my depth finder goes crazy.

Rattlesnake Gal · 09-22-2010, 11:30 AM

FLboater, my attachment is actually part of a folded, vinyl-ish, whole lake map. I chose that area because I was interested about where the underwater mountain names came from. From the above e-mail that I received from USGS, I suspect the name are not official.

This map is quite interesting for studying and I look at if often. I'm glad R-Guy snapped it up when he saw it at County Stores hardware in Milford. I hope the local retailers that are listed above have a lot of copies! Thanks Rattlesnake Guy.

When I get back to the camp, I can get a better scan of the entrance to Winter Harbor and send it along to you.

SIKSUKR · 09-22-2010, 12:53 PM

Cool map RG, gotta get me one. This map got me looking at the depth recordings on my Bizer. I found an area that I travel frequently that I never thought about being shallow. Half way between Jolly and Sandy in the Broads it gets down to 12 ft! Can I name it, huh, huh, can I, can I?

SAMIAM · 09-23-2010, 08:13 AM

Flboater, I'm curious too. I've noticed that during a NW wind the swells build up at the entrance of Winter harbor....even bigger than the broads.

KBoater · 09-27-2010, 11:24 AM

I bought the map yesterday at Fayes. I think the Winter Harbor Entrance thing is related to how you cut the entrance. The 2 side points sand bars are larger than I thought.

Great map.

Diver1111 · 09-27-2010, 12:13 PM

Neither Fays not Silver Sands has the bathymetric chart posted here. They are made by Navionics but marketed by MapTech (508-990-9020).

Price is $14.95 and they have a limited number in stock; Re-print set for about Feb. 2011. At some point they will contact Winni marinas and stores etc. and get them out that way also.

KBoater · 09-27-2010, 04:03 PM

The Map I bought at Fays is a navionics hotmapes premium.Lake Winnipesaukee

09-20-2010, 12:11 PM	#1
fltsimguy Senior Member Join Date: Aug 2010 Posts: 69 Thanks: 14 Thanked 30 Times in 11 Posts	Underwater Topography Aside from the depth contours on Bizer maps, has anyone ever seen a map of the underwater topography of the Lake? I've always wondered what it looks like down there. Mike

09-20-2010, 02:46 PM	#4
Rattlesnake Gal Senior Member Join Date: Nov 2003 Location: Central NH Posts: 5,252 Blog Entries: 1 Thanks: 1,451 Thanked 1,349 Times in 475 Posts	Navionics Map This sample of my Navionics map seems to be a bit more detailed for underwater topography. I did a little investigating when I spotted that they named some of the under water mountains in the lake. The person I contacted at Navionics was sure that USGS was the one to name these features. This is the response that USGS sent back: Underwater features generally are not shown on USGS topographic maps. I took a look at the USGS Geographic Names Information System (GNIS) database at U.S. Board on Geographic Names and found no features by those names listed in New Hampshire. I am forwarding your inquiry to the GNIS Manager, for further response. (I have not pursued the issue any further.) Attached Images

09-22-2010, 10:39 AM	#8
KBoater Senior Member Join Date: Apr 2004 Location: Wolfeboro Posts: 521 Thanks: 10 Thanked 29 Times in 15 Posts	Winter harbor RG great map. Is there a set of the lake? I'm interested in the enterance to Winter Harbor. Everytime I drive thru there my depth finder goes crazy. __________________ Home Permanently in NH

09-22-2010, 11:30 AM	#9
Rattlesnake Gal Senior Member Join Date: Nov 2003 Location: Central NH Posts: 5,252 Blog Entries: 1 Thanks: 1,451 Thanked 1,349 Times in 475 Posts	Navionics Map FLboater, my attachment is actually part of a folded, vinyl-ish, whole lake map. I chose that area because I was interested about where the underwater mountain names came from. From the above e-mail that I received from USGS, I suspect the name are not official. This map is quite interesting for studying and I look at if often. I'm glad R-Guy snapped it up when he saw it at County Stores hardware in Milford. I hope the local retailers that are listed above have a lot of copies! Thanks Rattlesnake Guy. When I get back to the camp, I can get a better scan of the entrance to Winter Harbor and send it along to you.

09-22-2010, 12:53 PM	#10
SIKSUKR Senior Member Join Date: Apr 2004 Posts: 5,075 Thanks: 215 Thanked 903 Times in 509 Posts	Mt Celia? Cool map RG, gotta get me one. This map got me looking at the depth recordings on my Bizer. I found an area that I travel frequently that I never thought about being shallow. Half way between Jolly and Sandy in the Broads it gets down to 12 ft! Can I name it, huh, huh, can I, can I? __________________ SIKSUKR

09-20-2010, 01:12 PM	#2
NHKathy Senior Member Join Date: Sep 2004 Location: Moultonborough when I can / RI Posts: 699 Thanks: 180 Thanked 38 Times in 22 Posts	I have always wondered the same thing! I would love to see a map showing the bottom of the lake, minus the water....

09-20-2010, 02:00 PM	#3
MikeF-NH Senior Member Join Date: Apr 2009 Posts: 318 Thanks: 2 Thanked 120 Times in 80 Posts	other than Bizer, the last two versions of the Navionics chips provide very detained mapping of the bottom. The lastest version is accurate to like 5 ft. This chip will run in any Navionics compatible GPS.

The Following 6 Users Say Thank You to Rattlesnake Gal For This Useful Post:
Bear Island South (09-20-2010), DRH (09-21-2010), GsChinadoll (09-27-2010), Jonas Pilot (09-20-2010), Newbiesaukee (09-21-2010), SteveA (09-21-2010)

09-20-2010, 03:50 PM	#5
fltsimguy Senior Member Join Date: Aug 2010 Posts: 69 Thanks: 14 Thanked 30 Times in 11 Posts	That's a pretty cool graphic! The one area of the lake I was particularly interested in was The Broads. I've always been curious why the depth goes from 180'+ to 30' so quickly. Thanks for sharing!

09-20-2010, 06:18 PM	#6
jrc Senior Member Join Date: Apr 2004 Location: NH Posts: 2,689 Thanks: 33 Thanked 439 Times in 249 Posts	I have a pretty good feeling that Bizer knows where those names came from.

09-23-2010, 08:13 AM	#11
SAMIAM Senior Member Join Date: Apr 2004 Location: Moultonborough Posts: 2,893 Thanks: 334 Thanked 1,675 Times in 585 Posts	Flboater, I'm curious too. I've noticed that during a NW wind the swells build up at the entrance of Winter harbor....even bigger than the broads.

09-27-2010, 11:24 AM	#12
KBoater Senior Member Join Date: Apr 2004 Location: Wolfeboro Posts: 521 Thanks: 10 Thanked 29 Times in 15 Posts	Got The Map I bought the map yesterday at Fayes. I think the Winter Harbor Entrance thing is related to how you cut the entrance. The 2 side points sand bars are larger than I thought. Great map. __________________ Home Permanently in NH

09-27-2010, 12:13 PM	#13
Diver1111 Senior Member Join Date: Jun 2005 Location: Exeter NH Posts: 603 Thanks: 0 Thanked 1,032 Times in 227 Posts	Bathymetric map from Navionics Neither Fays not Silver Sands has the bathymetric chart posted here. They are made by Navionics but marketed by MapTech (508-990-9020). Price is $14.95 and they have a limited number in stock; Re-print set for about Feb. 2011. At some point they will contact Winni marinas and stores etc. and get them out that way also.

09-27-2010, 04:03 PM	#14
KBoater Senior Member Join Date: Apr 2004 Location: Wolfeboro Posts: 521 Thanks: 10 Thanked 29 Times in 15 Posts	The Map I bought at Fays is a navionics hotmapes premium.Lake Winnipesaukee __________________ Home Permanently in NH