How Deep Is Spring Lake, Michigan? Water Depths Around Grand Haven
Last reviewed July 2026
Ask how deep the water is here and you will collect a pile of disagreeing numbers, because a depth is only meaningful with its paperwork: who measured it, when, and at what water level. This page gathers the authoritative sources for each of the three waters - Spring Lake, Michigan, the Grand River channel, and the harbor - and explains what happened to the nautical chart that used to cover all of them on one sheet.
Spring Lake: the 40-Foot Answer
The definitive document is the lake board's own depth contour map, drawn from a hydro-acoustic survey of the full lake in 2014. Its physical characteristics table settles the question the internet keeps fumbling: maximum depth 40 feet, mean depth 18.2 feet, across 1,091 acres holding 19,845 acre-feet of water inside 25.3 miles of shoreline.
The shape matters as much as the maximum. The deep water runs as a trough down the lake's main body, with broad stretches beyond 30 feet and the 40-foot readings in the lower lake; the arms are another story entirely, with the map showing bayous like Petty's and Smith in single-digit and teens water. NOAA's Coast Pilot sketches the same picture in prose: depths of 19 to 42 feet along the lake, shoaling toward the head. One caution the map itself would give you: it is a lake-management document, a way to understand the basin - it is not a navigation chart, and no one should run a boat off it.
Every Depth Rides on Lake Michigan
The fine print on the board's map is the smartest sentence on it: the survey was run with Lake Michigan standing at elevation 579.16 feet. Spring Lake rises and falls with the big lake, so every number on that map is a photograph of one water level. In the high-water spring of 2020, when the nearby Holland gauge recorded its second-highest level ever measured, the same lake bottom sat under roughly four more feet of water than the map shows.
Depth and clearance are the same arithmetic running opposite directions: a high year adds water under your keel and subtracts air under the drawbridge. And if the depth at a private dock is what decides the boat, remember the level history is part of the property's paper trail - the flooding and hidden risks guide shows where to pull it before you commit to either the slip or the hull.
The Harbor and the River
The harbor's numbers are federal. NOAA's Coast Pilot and the Corps of Engineers' project describe about 23 feet through the outer harbor entrance and 18 to 21 feet in the river channel and turning basin - deep-draft water, maintained by the annual dredging cycle the Grand Haven Harbor guide covers. The South Channel behind Harbor Island is the local trap: a controlling depth of about 3 feet under fixed bridges as low as 9 feet, which is why the launches guide treats it as paddle-and-skiff water rather than a shortcut.
What Happened to the Chart
For decades the sheet for this water was NOAA chart 14933, Grand Haven including Spring Lake and Lower Grand River, at 1:15,000. Its last edition was published in 2013, and NOAA's chart-edition ledger records it canceled on April 5, 2023 - one entry in the agency's retirement of the entire traditional paper and raster chart line in favor of a single maintained format, the electronic navigational chart.
The replacement is better than the loss suggests. NOAA's Custom Chart tool builds geo-referenced PDF charts on demand from the current ENC data, at the paper size, scale, and center point you choose; pair it with the Coast Pilot's narrative chapters and you have a fresher picture of this harbor than the old sheet ever gave. Print-on-demand copies of 14933 still circulate, but no correction has reached them since cancellation; treat them as wall art with opinions.
Common Questions
How deep is Spring Lake at its deepest?
Forty feet, by the most authoritative measurement available: the lake board's depth contour map, built from a 2014 hydro-acoustic survey of the whole lake. The deep water runs as a trough down the main body, with the 40-foot readings in the lower lake, while the bayous branching off it are mostly single-digit shallows. Remember the survey's own footnote before quoting the number at a dock: it was taken at a specific Lake Michigan elevation, and this lake rises and falls with the big lake.
How deep is the water in the Grand Haven channel?
NOAA's Coast Pilot carries the working numbers: about 23 feet in the outer harbor entrance and 18 to 21 feet in the river channel and turning basin, maintained by federal dredging. The South Channel behind Harbor Island is a different world, with a controlling depth of about 3 feet. Published figures describe the maintained project, though; silt moves, so treat the current NOAA sources and your own sounder as the last word on any given day.
Can you still buy the Grand Haven paper chart?
Not as a living document. NOAA canceled chart 14933, Grand Haven including Spring Lake and Lower Grand River, in April 2023 as part of retiring its whole traditional paper chart line; anything printed from it since is a snapshot that no longer receives corrections. The maintained data lives in NOAA's electronic navigational charts, and the agency's Custom Chart tool will build you a current, geo-referenced PDF of this harbor at whatever scale you like, free.
Why do published depth numbers disagree?
Because a depth is really three facts wearing one number: where it was measured, when, and at what water level. The lake board's map says 40 feet from a 2014 survey; the Coast Pilot describes 19 to 42 feet along the lake; both are legitimate, measured differently, at different water stages. When you compare depths, carry the date and the datum along with the number, and when a specific slip matters to a specific boat, measure that slip.
Keep Reading
The Spring Lake guide covers living on the water these contours describe, the Grand Haven Harbor guide covers the working channel and its dredging cycle, and the drawbridge guide covers the clearance side of the water-level arithmetic.